by Jack J G November 2, 2007

When you see the girl lower back from behind, there might be two small holes, which will fit the thumbs of the hand if you grab the girl around the waist. That will lock the thumbs from sliding on the girls back. Thumb locker will allow the person holding the girl's waist to hold her firmly.
by Little Fluffy Clouds January 8, 2012

A term to describe someone's embarrassingly small penis and claim that it is massive. - First described by @_james_3005. 2017
Chelsea "He has a massive penis, Chantelle told me yesterday after she slept with him"
Bradley "What? That lying bitch, she told me he had a crotch thumb!!"
Bradley "What? That lying bitch, she told me he had a crotch thumb!!"
by THESPITFIRES October 19, 2017

by Don’t_worry May 20, 2021

by Moe.Ron24 May 13, 2016

by DougGimmiedome May 20, 2021

Guy1: Hey dude go on urban dictionary, go to my word and thumbs-it-up.
Guy2: I'm thumbsing it up now.
Guy2: I'm thumbsing it up now.
by Tiny Doug April 6, 2010
