Top Definition
A flaccid, shriveled, post-coitus, penis and is still moist and shiny from the amalgam of sexual juices.
After Roger tapped his girlfriend during a lunch time quickie. Sonja went to the bathroom to wash up and grab a doddle rag to come back and wipe off Roger's Butter Thumb.
by Dick Uppinsider May 19, 2015
5 Words related to Butterthumb
A girl who is perfect, except her thumb. AKA butterface.

More info at
"Megan Fox is such a Butterthumb"
by EyeAddiction July 26, 2009

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