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To suck air into the asshole and then fart it out. When one who has the ability to gain does this, it makes a strange sucking noise as they draw the air into their bunghole.
My cousin Peter has the unbelievable talent of being able to gain. WOW!
gain by Bitches Brew August 10, 2003
Related Words
gain by Duke September 24, 2003
1. synonym for cool, okay,good, good for you, good job
phil : i had sex with a female last night
Maxx: soo much gain for you



Rob: i ate a whole big mac today
Samantha: Gain on you


Caddy: i sucked some mean dick last night
pimp: GAIIIIIIIINNNN!

Raphael: i scored the winning goal last night
George: Gaintastic!!
gain by icallquest August 19, 2008
Slang word for male genitalia.
Relatively new.
Can be used sexually and nonsexually.
A: I've got a big gain

B: I'm a guy, I got a gain
Gain by DoctorCaduceus May 16, 2023

Gain of function 

Is a phrase in Military diplomatic doublespeak meaning "Weaponization".
After watching Dr Fouci and others discussing the issue of "Gain of function research" for some time now, you should realize that -

Gain of function means Weaponization.
In the same way as "doing collateral damage" means "Killing innocent civilians" in diplomatic military language.
Gain of function by RocketMan November 30, 2021

Gain’t 

Not gay, not homo, no dicc on dicc, no vag on vag
I am gain’t because I don’t like the same gender
Gain’t by Duduheadas September 15, 2018