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

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

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 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

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

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