tummy knuckle 

the very center of a persons' abs (more common when it's a 4 pack) that is harder than the rest of that abs, and tightens similar to a knuckle. It hurts when hit directly, similar to the pain of playing bloody knuckles.

(out of stupidity) I'm going to break your tummy knuckle!

My tummy knuckle hurts after doing so many crunches.

tummy knuckle by Aaron Moe Scott March 31, 2010

Tommy Knuckles 

A general phrase that can be used to describe someone extremely awesome or certifiably nuts. Used frequently in the northern midwest.

Hey, you know that guy Mike?

Yeah, that dude is a total Tommy Knuckles.

Tommy Knuckles by dndgamer May 1, 2010

Tommy Tuff Knuckles 

Tommy is a bissness man out of NYC. Getting his start by manufacturing 6.5" chains and cables for construction sights. He's a know friend and colleague of Balboni

You guys work with Tommy Tuff Knuckles out of New York City, don't ya?

Tommy Tuff Knuckles by Tommy Tuff Knuckles August 29, 2023

timmy tough knuckles

A man, boy or diphshit that acts tough (TUFF) whenever possible. This often ends in the embarrasement of the said man, boy or dipshit

"Hey bro, whats up my g, wanna hit up this block cuh?"
"ITS TIMMY TOUGH KNUCKLES"

timmy tough knuckles by andrewdrainy May 27, 2025

Timmy tough knuckles

An adjective (or noun if used as a title) to describe someone who is doing something cool and exciting.

“Wow! That backflip Lindsey did was so Timmy tough knuckles”

Timmy tough knuckles by PaleHungryBathtub January 1, 2026