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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
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