Anytime you (or someone else) is trying to look casual but are secretly flexing in a picture or pose to make your muscles (usually arms) look bigger. This includes but not limited to, a hidden clinched fist to make your biceps look bigger, and also having your arms pressed against your body to make them look bigger.
Look at that guy, who is he trying to kid. His arms are not that big. He's just doing THE SILENT FLEX.
by ColeManND87 January 16, 2015

by Ggbandz May 19, 2018

To do more work than nesscary, like when someone flexes their back more than needed to do something.
This phrase is usually assoicated with doing with doing extra credit homework or taking 2 hours to work that can easily performed in 30 mins, generally all schoolwork that geeks and nerds do.
This phrase is usually assoicated with doing with doing extra credit homework or taking 2 hours to work that can easily performed in 30 mins, generally all schoolwork that geeks and nerds do.
Me:How many of pages of coursework you do? I did 9, font size 14
Zubair: Man I was up till 3 in the morning and did 33 pages, font size 10.
Me: Your long flex dude.
Zubair: Man I was up till 3 in the morning and did 33 pages, font size 10.
Me: Your long flex dude.
by Carl Anka April 12, 2006

Uber flex is what happens when you and your brothers go out drinking and try to fight the Uber driver because he won’t let you in the car. Usually, one of the potential passengers takes off his shirt and flexes his muscles to show signs of aggression.
Apparently, U got hammered last night and started Uber Flexing on the driver who wouldn’t let you inside the car.
by Mike McGaffrey January 5, 2019

It is after Christmas and it’s really cold!! But for some they are iced out and from January 1st to January 15 it’s flexing season. That means you have to wear the most expensive or the best fits you have in your closet!!
by Megavirgin234 October 15, 2019

by hits pls March 20, 2021

by heartthatmaryjane April 5, 2011
