the awkward piece of skin between your thumb and pointer finger
"dude, my thumb crotch is so itchy."
"i know, so is my penis."
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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!!"