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Having freakishly large thumbs with average size hands
Hey Thumby, two freakishly large thumbs up!
thumby by firecracker83 September 22, 2011
Words you can keep
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
Australian sexual slang referring to the act of using one's thumb to bring your partner to climax
You know Sarah? Oh yeah Davros's sista? Yeah, She gave me a mighty fine Thumby last night over in Bendigo.
Thumby by SpanglyCharly January 29, 2021
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?
Thumby by Ancient Armadillo June 17, 2018
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.
Thumby by Ancient Armadillo June 17, 2018
sticking a thumb up a man's ass just before he climaxes
Oh girl I am about to finish, gimme a thumby!!
Thumby by Bundestag May 29, 2018

thumby monster 

It's a digit that is employed in the butt.
There's a thumby monster around.
thumby monster by Kublai Khan October 27, 2003
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