1. A dude that is really into fat chicks
2. A chick with a lot of fat.
1. "Wow, check her out. HOT!"

"You mean the chick holding the big-mac? Sorry, bro, i'm not down with the thickness"
2. "That chick scarfing the big-mac is really down with the thickness."
by creeky-creak the freak January 30, 2010
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When a girl is all tits and no ass
"Hey Billie, I've been hitting up Emma a lot lately. You think she's hot?"
"She's upside down thick. Personally I'm a thigh guy but yeah I guess she is."
by Intelligible Lizard June 26, 2018
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A girl with a thin upper body/waist and a thick ass/thighs
Aye girl you upside down thick what's your number
by Blank dream July 3, 2017
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A term describing the feeling after a woman agreeing to get down and dirty and when she undresses she reveals an unexpected not before revealed thickness around booty or breast that comes as a pleasant surprise to the beholder. The feeling of joy and unexpected excitement is what it means to be "Down with the thickness"
Frederik: "Dude Sasha is such a pothead, she always wears big jeans and sweaters so you can never see her body, but after we fiddled on the sofa and she undressed I was surprised by her voluptuous curves!"

Lauge: "Wauw, how did did you take it?"

Frederik: "I was totally down with the thickness!"

Lauge: "Nice!"
by Mandasm March 22, 2023
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Indicating an individual that is attracted to a person of thick/health proportions.
Pookie: "Yo...that chick is phat! Look at that ASS! I am so down with the thickness."
by guruerror September 26, 2019
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