When you stick your thumb in a female's asshole while you're banging her doggy style. If she complains, you say it was to keep your thumb warm.
Bro, I was banging this chick doggy style behind a dumpster for hours and I gave her a thumb warmer. She was into it.
by JT Return of the Mack 9797 May 25, 2025

by Bubba G Dang May 20, 2021

by brosgethoes June 4, 2022

The guy has been growing things since he was a little fucking kid, he doesn't have a red thumb. Not all his plants die, and none die without cause or due to neglect. He takes good enough care of his plants, and though people can at least question his sanity, maturity, and responsibility (unlike some other people), there isn't anything about him that indicates he is an irresponsible person by nature.
by The Original Agahnim December 27, 2021

by GayThighSenpai May 5, 2022

A condition that occurs after doing manual labor in which your thumb doesn't react as fast as normal.
by SaintAnkey October 21, 2014

A Black Thumb is the male equivalent of a black widow. It's a toxic, narcissistic man who is poisonous to everyone he encounters, much like Henry the VIII. His heart is black as the underworld, and he's as attractive as a thumb, hence black thumb.
by Siouxsie Supertramp September 26, 2023
