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Similar to a fist bump, but more intimate, given the smaller surface area. First observed among parents and their kids.
MADDY: Dad, I got 100 on my Social Studies test!

DAD: Way to go! Thumb bump
by jimp31 March 09, 2014
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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. 👍
Alright bro, good hanging, I gotta go.. *thumb bump*
by Dan Cicu January 11, 2017
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