When you put your thumb in someone’s ass while walking by... Like a Wet Willy but with your thumb in their butthole.
by BEANERSCHNITZEL June 6, 2018

by Brdmn68 May 2, 2018

by Balooga420 May 20, 2021

medical term: a tear of the ulnar collateral ligament of thumb, causing the thumb to bend sharply away from the plane of the hand
by dadzone June 19, 2010

A sexual intercourse position in which a thumb is pressed into the vagina with as much pressure possible.
by anonymous May 20, 2021

Person 1: Yooo how was your night?? Did that girl sleep over?
Person 2: Ya lmao I thumb butted I think I love her.
Person 2: Ya lmao I thumb butted I think I love her.
by BigKidsAreLarge November 8, 2016
