When you get swole solely from masturbation. While some may go to the gym to get huge arms, someone with porn gainz gets huge arms from touching themselves. It is like the natural shake weight of the body.
Guy 1: holy shit how to you get so swole

Guy 2: its all in the porn gainz man, just wank it 3 times a day to get killer guns like these
by Swellville August 5, 2017
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A phrase which arose out of a conversation between future body builder Andrew Sebastian and Deondre Waltenberger
Hey! Whatchu think you're doing in our swamp of gainz?
by qtsxy October 23, 2019
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Snatching up all dem niggas and catchin' em' all like a real thug should.
This nigga's Julian's Poke' Gainz are too real boi.
by Chrix112193 July 9, 2014
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The gym!International chest day. Gotta get juicy and tan af.
Today I’m going to the glorious house of gainz t get a pump on.
by Glorious house of gainz November 20, 2017
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