1. [n]  a heavy dull sound (as made by impact of heavy objects)
2. [v]  strike with a dull sound; "Bullets were thudding against the wall"
3. [v]  make a dull sound
4. [v]  make a crunching noise, as of an engine lacking lubricants

Thud
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1. \Thud\, v. i. & t.
   To make, or strike so as to make, a dull sound, or thud.
         Hardly the softest thudding of velvety pads. --A. C.
                                                  Doyle.
         The waves break into spray, dash and rumble and thud
         below your feet.                         --H. F. Brown.
   

2. \Thud\ (th[u^]d), n. [Cf. AS. [thorn][=o]den a whirlwind,
   violent wind, or E. thump.]
   A dull sound without resonance, like that produced by
   striking with, or striking against, some comparatively soft
   substance; also, the stroke or blow producing such sound; as,
   the thrud of a cannon ball striking the earth.
         At every new thud of the blast, a sob arose. --Jeffrey.
         At intervals there came some tremendous thud on the
         side of the steamer.                     --C. Mackay.
   

1. Yet another metasyntactic variable (see foo). It is reported that at CMU from the mid-1970s the canonical series of these was "foo", "bar", "thud", "blat".

2. Rare term for the hash character, "#" (ASCII 35). See ASCII for other synonyms.

[Jargon File]