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2.
–noun (offensive)

1. a person with a penis the size of a thumb.
2. a stupid, irritating, jackass.
ftballrulz: WAna cyber ?
PalePumpkinHead: This is your mother, thumbdick.
ftballrulz: u r a bull dyke.
by PalePumpkinHead March 16, 2007
 
1.
A word used to describe a man who is endowed with a short and stubby penis with the dimensions of the average sized human thumb.
Fuck you, thumb dick! You are hung like an infant!
by Cballznhoney July 10, 2008