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 Eaton Holgoode May 18, 2015
When your wiping yourself and your thumb accidentally breaks through the toilet paper and gets "dirty".
Dude! I dropped the kids off at the pool last night and got covered in thumb butter when I was wiping with that cheap paper my wife buys!
Awww man that is the worse!
Awww man that is the worse!
by minuccp May 1, 2009