from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Slang The smallest degree or amount: property that is not worth a tinker's damn.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a worthless amount
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. something of little value
Probably from the reputation of tinkers for cursing.(American Heritage® Dictionary of the English Language, Fourth Edition)
A popular etymology is that tinkers used a small piece of dough or clay, a dam, to stop the flow of solder until it solidified. The dam was single-use, and was thrown away afterwards as useless. (Wiktionary)