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1. (noun) An urban derivative of the word "gains", referring to additional muscle mass acquired through lifting weights.

2. (noun) Any form of protein used within the diet of a bodybuilder consumed with the intent of increasing overall muscle mass.
(ex) "BRO! Check out these sick gainz!"

(ex) "Dude, I gotta cut this short. I need to get in my gainz every 2 hours!"
gainz by #NurseMike November 28, 2016
Related Words
What you get from curling in the squat rack and dumbbell pressing every day
Bro 1: Yo brah, I had a sick workout yesterday. Check out mah gainz.
Bro 2: Sick, brah.
gainz by Curlbrah February 3, 2013
Ex.1: I love this shirt bruh. It makes me look so gainzy!

Ex.2: I gotta hit the gym, I'm trynna look gainzy in the club tonight Moe.
Gainzy by Professor Gainz December 20, 2016

glorious house of gainz 

Today I’m going to the glorious house of gainz t get a pump on.

Gainz Goonz 

A group of people you always see when you go to the gym. They are always working out harder and longer than the average person, partaking in muscle building, strength training, cardiovascular, or aerobic activities.

Often used as a derogatory term by people that don't understand the lifestyle, some self-proclaimed Gainz Goonz use the term as a positive symbol for hustling for greatness.
(Ex) Person 1: Aye Bruh check out those Gainz Goonz in the gym. Didn't we just see them yesterday?

Person 2: Yeah, fam they're always in the gym doing the most.

(Ex) Bro 1: Man look at the muscle mass of those guys. My gainz are nothing compared to theirs.

Bro 2: Those Gainz Goonz are straight gym hustlers bro. I see them in the gym everytime I come. I heard they workout everyday!
Gainz Goonz by Elite_Mentor May 29, 2017
Gainz is similar in meaning as gains, but don't get fooled by the two. Gainz is when you need added weight in your dips to make them harder. It's the most alpha way of explaining your muscle mass.
Bro 1: don't spot me
Bro 2: why not you can't lift that

Bro 1: you're stealing my gainz son