forehead flexing

When you flex your forehead muscles, like when Arnold Schwarzenegger screams anything.

Arnold Schwarzenegger forehead flexing while saying "IT'S NOT A TUMOR"

by TrafficKing May 12, 2014

flexing on the book

Gangster that is hella religious

Yo my man Ronald Is flexing on the book

by Der vvv May 17, 2018

colon flex

Fart, pass gas or rip ass

My wife and I were snuggled closely on the couch watching The Notebook, when suddenly she did a colon flex, which confirmed she had eaten eggs for dinner.

by Thunderthighs11 August 19, 2019

Not to over-flex

(original: Nepřeflexit)
verb
1. careless activity; do not exceed the literary maximual limit of Flex
2. the eleventh commandment; "You will not over-flex in front of the fellas, since the God of flex would punish you."

Guy1: "Dude, that was just so easy. First try bro, i don't know what was supposed to be the challenge here.
Guy2: "Be careful not to over-flex tho...
Guy1: *Fucks up in a spectacular way*

by PR05TEJA November 30, 2020

had to flex

Had 2 stunt on them hoez

Sorry bro....had to flex

by Urmomloz February 4, 2017

baby flexing

when you act like a big shot but you aint shit

Dre- "Did you see Will today?
Me- "yeah that nigga was mad baby flexing"

by hdriscoll96 November 16, 2015

Captain Flex

A gymaholic mound of muscle who's either at the gym, or using the weights bench in his living room, in a bid to get rid of his chubby, youthful looks. Most likely to be found constantly flexing in front of 6th formers and frequently spraying them down with his mr muscle spray.

Captain Flex's movement resulted in such a gun show that it caused his jeans to rip. "Damn you fifteens!"

by Durk Durka February 3, 2009