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1.
Sucking someone's thumb, miming the action of oral sex.
"You gave him a thumbjob?!"
"He seemed to enjoy it!"
by JonnyJJ September 09, 2007
 
2.
When a chick rubs the area of a man's body where his ball sack connects to his penis with her thumb(s).
The prostitute will give thumb jobs for five dollars.
by Tom and Mike June 19, 2006