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 13, 2014

had to flex

Had 2 stunt on them hoez

Sorry bro....had to flex

by Urmomloz February 04, 2017

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 stop

When you cross your legs and flex your butt muscles together to hold a dump in because your anal sphincter isn't strong enough.

Dude I had a close call this morning. I broke into a shuffle on the way to the bathroom and had to pause half way to do a flex stop.

by hilarioyo September 29, 2013

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 05, 2017

flex a grumpy

To take a shit outdoors

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

by agroman2012 October 09, 2011

hacienda flex

You already know what’s next

It’s the hacienda flex

-when you flex real big on that hacienda

-so much

“You see that hacienda flex??? Ohhhh shit! You know what’s next!!!l

by Onion Federal February 06, 2023