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

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

flexing dominance

To intimidate a rival bro passive aggressively by commenting on an Instagram picture.

I was flexing dominance at someone... Someone named Steven.

by Pauleeeee June 21, 2016

False Flexing

When you spend an excessive amount of money in order to look wealthier than you are.

Guy 1: "Hey, you heard Griffin bought a Gucci belt?"

Guy 2: "Hey, you heard he spent his whole paycheck on it?"

Guy 1: "Oh. He's false flexing."

by NBAslimeboy January 27, 2017

flex a grumpy

To take a shit outdoors

That burrito is kicking in. I'm fit to flex a grumpy.

by agroman2012 October 11, 2011

Flex on Gex

The act of flexing on Gex. May be used to refer to flexing on Gex himself, or applied more broadly to any situation.

I’m gonna Flex on Gex so hard tonight, Jackman’s gonna have to transport me in the ambulance.

by Fagbag jackson December 20, 2021