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A guy (or girl) whose body parts above the shoulders look like a thumb. Usually a large forehead.
Here come the thumbs!!
Thumb by Phatho May 20, 2017
verb, done 1)to a frisbee in the act of throwing it, or 2)to a book, to scan or speedread it.
1)dude, thumb me the frisbee!

2)i'm thumbing through my history book for the test, but i think i'm gonna flunk.
thumb by Brah123 December 28, 2005
An inside reference to the genitalia of one, Jacob. This is due to the fact that said non-circumcised penis suspiciously resembles a thumb, sans the nail. Upon closer examination (a daunting task in and of itself) this third 'thumb' is quite grotesque and awkwardly suited for aural insertion. Beans are meat.
Thumb by Traust May 19, 2008
A women with a large clitoris, usually when erect, but sometimes large even before arousal.
"Ohhh- weee look at that thumb, pressin up against her panties. Thang big as hell, finna pop out!"
thumb by atm TJ July 30, 2019
a very stupid and ignorant asshole who always thinks he's right
thumb by Anonymous June 29, 2003
A very funny, very good looking, rugged type male, with thumb like qualities and tendancies toward arrogance and poor driving skills. Also known for his excessive blinking and oil. It is usually easy to tell when he has been eating, especially powdered donuts. Can be located by performing a thumb-scan.
Ali: where is thumbkin where is thumbkin?
Thumb: here i am! here i am!
thumb by shrew February 3, 2005