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 Enya Goode May 19, 2015

The Urban Dictionary Mug

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A girl who is perfect, except her thumb. AKA butterface.

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

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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