Similar to a fist bump, but more intimate, given the smaller surface area. First observed among parents and their kids.
by jimp31 March 29, 2014
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
1/11/17 Originated by Dan Cicu from Seattle, WA. Thumb Bump is similar to the "fist bump", with a clenched vertical fist instead, displaying the "thumbs up" in approval. 👍
by Dan Cicu January 11, 2017
When one is bored and lonely so one masturbates with a thumb wedged knuckle-deep into one's own anus.
by J. M. Fuhqueny November 5, 2023
A retarded homosexual who scours the Urban dictionary giving thumbs down to everyword just for the hell of it. They also enjoy shoving their thumbs down into their underpants and giving their anus a good poke.
by Mr Lizard August 25, 2004
A Thumb Bump is a fist bump with a thumbs up to finish it off. Originated on classic TV show Thunder in Paradise. Randolph "Hurricane" Spencer and Martin "Bru-dog" Brubaker would do a Thump Bump to celebrate a job well done.
by HurricaneSpencer August 12, 2022
by Warday1780 December 10, 2022