Flex rex

When a guy flexes his dick to make it bigger.

yo did you hear about Dave pulling a flex Rex

by Camoflame88 May 27, 2016

Avon flex

A chinese person who thinks that they are cool so they put shitty tatoos and sing shitty raps.

"Omg! Is that Avon Flex, fucking fag"

by Aig group May 12, 2016

flex purchase

To show off your wealth by buying something incredibly stupid, to buy something for its glamour rather than its practicality, flexity over quality

Luke: Hey man, that's a nice jacket, was that a flex purchase?
Liam: Yeah, this poor dude was standing next to me.

by ahsibfilm May 1, 2016

Sandy Turd Flex (STF)

When you're taking a dump and your butt flexes forcing the poop to retract into your butthole causing the sensation of sandpaper going up your butt.

"Man I hate it when I have a sandy turd flex (STF) in the bathroom"

by Matt Stazjic October 3, 2016

Sumo flex

To brag or boast about your personal belongings or accomplishments

Man Keaf just got a new Rolex he was on Snapchat sumo flexin

by BlatlanticK ReKords May 5, 2018

Flex

the word flex usually means to bend a joint, but in this case, to flex something means to steal something that is not yours, so its a verb.
my friend created this word so i added it because i thought it would catch on.
flex, present tense
flexed. past tense

"Alex, that dude just flexed your phone"

by diamondman200 May 6, 2018

Flex Boi

A gay kid that you should stay away from or he will try to rape you.

Stay away from Flex Boi.

by Flex Boi October 16, 2019