A shapely and pleasant looking ass, usually something accompanied by muscular thighs and hips. A gender neutral adjective word though mostly seen on gay gym bunnies. Not to be confused with" Table top ass" "Donk" or "Fattie". Synonyms for Bubble butt, muscle butt, and cake ass.
Shapely gym bunny walls by two guys.

Straight Guy 1: Shit! Did you see that?

Straight Guy 2: Hell yeah, That fattered gym bunny?! I'd hit it. No homo

Guy 1: Dude.......

Booty Bubble butt pass the ass
by Asstothegrass24 February 16, 2016
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The opposite of flattering.
Can be used to avoid lying when someone asks you if they look fat if said quickly enough.
Girl: Do these pants make me look fat?
Guy: No, it is very fattering.
Girl: Thanks.
by chicky noodles May 24, 2014
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When something should look flattering on you, but just makes you look fat. Fattering.
Used in a sentence - 'I'm not so sure about those pants... they're kind of fattering.'

Or when you're trying to give a compliment, but don't think it's deserved- 'Wow! Those pants are extremely fattering!'
by jd9d April 6, 2010
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A lighter that doesn't do much but lazes around all day.

It can be personified to refer to a human being or animal or even a bird.
Bogdan: Hey Mech Adams, can you pass the lighter?

Mech Adams: Oh, that one? That's a fatter.

Joe & McAdams: Sorry, what?

Mech Adams: It doesn't work; it burns neither calories nor cigarettes.

--

Joe: Hey, let's work on the assignment tomorrow.
Donald: Sure, I'll find someone on Fiverr.
Joe: You fucking fatter.
by momalord March 5, 2022
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To gain more fatness, or to become more fat than you were before.
Holy crap, Joe, did you just get fatter?
by Hampikizzel Fo' Shizzel May 29, 2005
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