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when someone is so fat when you pick them up your thumbs disappear in there FUPA
John: when i picked up Mary last night my thumbs disappeared in her FUPA
Frank: so your saying she is thumby ?
John: ya
by frank jack murphy the fouth September 25, 2008
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3
sticking a thumb up a man's ass just before he climaxes
Oh girl I am about to finish, gimme a thumby!!
by Bundestag May 29, 2018
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4
The act of violently inserting your thumb into someones rectum.
Person 1: how did you get that black eye?
Person 2: I ran up behind my girlfriend and gave her a surprise THUMBY.
Person 1: You're pretty stupid aren't you?
via giphy
by Ancient Armadillo June 17, 2018
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5
The act of violently inserting your thumb into someones rectum.
person 1: So how did you get that black eye?
Person 2: I ran up on my girlfriend and gave her a surprise THUMBY.
Person 1: Oh that was stupid.
via giphy
by Ancient Armadillo June 17, 2018
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