by Gonzalo Barrios June 2, 2016

Person A: "Hey, what's his name?"
Person B: "Flex Thunderstache."
*Person A just shit their pants. They can't handle the 100% man that Flex thunderstache is.*
Person B: "Flex Thunderstache."
*Person A just shit their pants. They can't handle the 100% man that Flex thunderstache is.*
by F.TS. July 8, 2009

by Gameitech September 25, 2012

a nervous twitch during an orgasm or just before intercourse, in which one individual "flinches"...a bit like tourettes....and makes the other person included in the sexual act laugh and chuckle...laughing and chuckeling is a major turn on for some people...so people with a "sex flex" are not left lonely!!!
person 1: mmm....yeah baby
person 2: *twitches*
person 1: omg wht was that?! hahaha! u sex-flexed!!! oh yesss! i am the god of sex!!!
person 2: *blushes* i have ....tourettes....
person 1: sex-flexing is THE biggest turn on ever.....mmmm.....do it again....
person 2: *twitches*
person 1: omg wht was that?! hahaha! u sex-flexed!!! oh yesss! i am the god of sex!!!
person 2: *blushes* i have ....tourettes....
person 1: sex-flexing is THE biggest turn on ever.....mmmm.....do it again....
by Caroline Ratcliffe June 12, 2006

When having sex you stick the big toe in to the vagina and flex in the g-spot. You continue this until she has an orgasm.
by black magic January 14, 2008

A Major flex But also Lowkey The point of Killing everyone and everything But Also doing It in the most humble way
by Suavee 🕊 September 20, 2017

flex tape, all hail the great flex tape, we preach to flex tape, flex tape is worshipped by all of mankind, it can fix anything, even your hopeless love life
yo, me and carli, we were having trouble with our marriage but we just go fukkin flex tape bro and we're happy bruh
got a giant black hole in the middle of the sun? fix it with flex tape ( but like wear fucking sunscreen for fuck sake my god)
got a giant black hole in the middle of the sun? fix it with flex tape ( but like wear fucking sunscreen for fuck sake my god)
by BumPears1000 October 8, 2018
