1. [n]  small mackerel found nearly worldwide
2. [n]  a traveling repairman who mends broken things (such as metal household utensils)
3. [n]  (British) an itinerant Gypsy
4. [n]  a person who enjoys fixing and experimenting with machines and their parts
5. [v]  do random, unplanned work or activities or spend time idly; "The old lady is usually mucking about in her little house"
6. [v]  work as a tinker or tinkerer

Tinker
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1. \Tink"er\, n. [From {Tink}, because the tinker's way of
   proclaiming his trade is to beat a kettle, or because in his
   work he makes a tinkling noise. Johnson.]
   1. A mender of brass kettles, pans, and other metal ware.
      ``Tailors and tinkers.'' --Piers Plowman.
   2. One skilled in a variety of small mechanical work.
   3. (Ordnance) A small mortar on the end of a staff.
   4. (Zo["o]l.)
      (a) A young mackerel about two years old.
      (b) The chub mackerel.
      (c) The silversides.
      (d) A skate. [Prov. Eng.]
   5. (Zo["o]l.) The razor-billed auk.
   

2. \Tink"er\, v. t. [imp. & p. p. {Tinkered}; p. pr. & vb.
   n. {Tinkering}.]
   To mend or solder, as metal wares; hence, more generally, to
   mend.
   

3. \Tink"er\, v. i.
   To busy one's self in mending old kettles, pans, etc.; to
   play the tinker; to be occupied with small mechanical works.