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

fat flex

A very hard flex that has an effect on people so strong they could end up dazed and confused

Damn man, he hit us with a fat flex when he walked in with the Gucci sweater and got two girls at once.

by fatflexer2000 February 9, 2019

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

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 flexington

Someone who shows off all the time or flexes about things in his or her life

HaqL is a flex flexington because he flexes every shot he hits

by Dumster March 4, 2017

Flex-Mas

When one shows off - flexes - there christmas gifts within the next week after christmas.

S "shit man nice jacket, shoes, hat"
K "yeh man xmas presents'
S ' ahh standard Flex-mas'

by GPSK December 23, 2009