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1.
Thumb-fucking is a term describing repetitive text-messaging.
Will you stop thumb-fucking your girlfriend and listen to me for one second?

Who are you thumb-fucking?

by Bear Toe March 13, 2008
 
2.
Repeatedly sending and or receiving erotic and graphic txt messages of a sexual nature
Paul: You still txting with Susan?

Peter: Hehe yeah...

Paul: Dude quit thumb fucking your girl friend and lets go.
by Cheddarbox November 18, 2008