flex the rainbow

When the penis shaft bends slightly during homosexual anal intercourse

when you flex the rainbow in Shane he really likes it!

by Literalistic September 30, 2023

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

Flex Day

December 26th is flex day. Show off all of your expensive items to your friends. You can also flex with the new items you got at Christmas.

"Billy it's December 26th which means it's flex day, I bet you don't have the iPhone 11 Pro Max."
Billy answered while holding back tears, "you're right Joe, I don't."
Billy replied, "wait, who's Joe?"

by Andy Andy October 27, 2019

Flex

When you flex your girl, your showing her off to everybody posting pics with each other & being a simp because you want everybody to be jealous.

Damn I just got a new girl her names kyleigh I be flexin her cuz she’s the baddest bitch in town.

by Flex yo girl December 5, 2020

Feel Flex

When you feel good and alpha af

I feel flex when I hit a PR on bench

by Tryceracrocs December 14, 2020

casu-flexing

When, usually a man, takes a picture of himself with his muscles flexed but is trying to look like he's standing casually.

"Look at the pic of this dude casu-flexing."

by Universe42 December 15, 2020

flex Seal challenge

The Incredibly Popular Internet Challenge in which participants attempt to completely seal their asshole tight, and then attempt to shit.

Bro, Did you see that sick flex seal challenge video by Logan Paul? it was almost as good as the forest in Japan!

by Mr. Huffman November 6, 2020