1. [n]  a long and hard-hit fly ball
2. [n]  intense adverse criticism; "Clinton directed his fire at the Republican Party"; "the government has come under attack"; "don't give me any flak"
3. [n]  a sudden very loud noise
4. [n]  an explosion (as of dynamite)
5. [n]  a strong current of air; "the tree was bent almost double by the gust"
6. [v]  use explosives on; "The enemy has been shelling us all day"
7. [v]  hit hard; "He smashed a 3-run homer"
8. [v]  make a strident sound; "She tended to blast when speaking into a microphone"

Blast
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1. \-blast\ [Gr. ? sprout, shoot.]
   A suffix or terminal formative, used principally in
   biological terms, and signifying growth, formation; as,
   bioblast, epiblast, mesoblast, etc.
   

2. \Blast\ (bl[.a]st), n. [AS. bl[=ae]st a puff of wind, a
   blowing; akin to Icel. bl[=a]str, OHG. bl[=a]st, and fr. a
   verb akin to Icel. bl[=a]sa to blow, OHG. bl[^a]san, Goth.
   bl[=e]san (in comp.); all prob. from the same root as E.
   blow. See {Blow} to eject air.]
   1. A violent gust of wind.
            And see where surly Winter passes off, Far to the
            north, and calls his ruffian blasts; His blasts
            obey, and quit the howling hill.      --Thomson.
   2. A forcible stream of air from an orifice, as from a
      bellows, the mouth, etc. Hence: The continuous blowing to
      which one charge of ore or metal is subjected in a
      furnace; as, to melt so many tons of iron at a blast.
   Note: The terms hot blast and cold blast are employed to
         designate whether the current is heated or not heated
         before entering the furnace. A blast furnace is said to
         be in blast while it is in operation, and out of blast
         when not in use.
   3. The exhaust steam from and engine, driving a column of air
      out of a boiler chimney, and thus creating an intense
      draught through the fire; also, any draught produced by
      the blast.
   4. The sound made by blowing a wind instrument; strictly, the
      sound produces at one breath.
            One blast upon his bugle horn Were worth a thousand
            men.                                  --Sir W.
                                                  Scott.
            The blast of triumph o'er thy grave.  --Bryant.
   5. A sudden, pernicious effect, as if by a noxious wind,
      especially on animals and plants; a blight.
            By the blast of God they perish.      --Job iv. 9.
            Virtue preserved from fell destruction's blast.
                                                  --Shak.
   6. The act of rending, or attempting to rend, heavy masses of
      rock, earth, etc., by the explosion of gunpowder,
      dynamite, etc.; also, the charge used for this purpose.
      ``Large blasts are often used.'' --Tomlinson.
   7. A flatulent disease of sheep.
   {Blast furnace}, a furnace, usually a shaft furnace for
      smelting ores, into which air is forced by pressure.
   {Blast hole}, a hole in the bottom of a pump stock through
      which water enters.
   {Blast nozzle}, a fixed or variable orifice in the delivery
      end of a blast pipe; -- called also {blast orifice}.
   {In full blast}, in complete operation; in a state of great
      activity. See {Blast}, n., 2. [Colloq.]
   

3. \Blast\, v. t. [imp. & p. p. {Blasted}; p. pr. & vb. n.
   {Blasting}.]
   1. To injure, as by a noxious wind; to cause to wither; to
      stop or check the growth of, and prevent from
      fruit-bearing, by some pernicious influence; to blight; to
      shrivel.
            Seven thin ears, and blasted with the east wind.
                                                  --Gen. xii. 6.
   2. Hence, to affect with some sudden violence, plague,
      calamity, or blighting influence, which destroys or causes
      to fail; to visit with a curse; to curse; to ruin; as, to
      blast pride, hopes, or character.
            I'll cross it, though it blast me.    --Shak.
            Blasted with excess of light.         --T. Gray.
   3. To confound by a loud blast or din.
            Trumpeters, With brazen din blast you the city's
            ear.                                  --Shak.
   4. To rend open by any explosive agent, as gunpowder,
      dynamite, etc.; to shatter; as, to blast rocks.
   

4. \Blast\, v. i.
   1. To be blighted or withered; as, the bud blasted in the
      blossom.
   2. To blow; to blow on a trumpet. [Obs.]
            Toke his blake trumpe faste And gan to puffen and to
            blaste.                               --Chaucer.
   

1. BLT, used especially for large data sends over a network or comm line. Opposite of snarf. Usage: uncommon. The variant "blat" has been reported.

2. [HP/Apollo] Synonymous with nuke. Sometimes the message "Unable to kill all processes. Blast them (y/n)?" would appear in the command window upon logout.