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1.
The girl used as the masthead of a porn post. Generally considered the, or one of the, hottest girl(s). From Sensible Erection.
thumbgirl plz!! we want more pics of teh thumbgirl!!!11
by Chop-Logik July 25, 2003
 
2.
teh Cathy
You think she's a thumbgirl until you scroll down.
by cancer October 18, 2003