Funny way to indicative having a flat butt.
“Kayla has a fatty, unlike lili she has a flatty
by Day_i February 21, 2021
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A woman with no discernable breasts.
Wow, from the neck down that chick looks like a dude, what a flattie.
by Big Douchebag May 1, 2009
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the worst type of fat chick. (fat AND no boobs)
"Check out that flattie, shes just your size Brady."
by CORE LansingMi September 1, 2008
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Shortened term for the fish flathead. No teeth but lots of fight. Stubborn and hard to get..

Also term for ugly sand dweller who hates others.
"I went fishing last night a caught a flatty. "

Ned"Geez did u see that flatty over there???"
Dez "Better throw her a line so she can catch the next bus outta here"
by Spahaz donquay March 31, 2020
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To urinate, whilst fishing. Said to have originated in South Perth.
Fisherman 1: I'm going to have a flatty.
Fisherman 2: Word.
by Mike clit November 2, 2008
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a person or thing with an abnormally flat butt.
gee wiz that boy is a flatty.
by The Three Wenches September 17, 2011
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Slang name for someone who believes that Earth is flat, i.e., not spheroid.
Dude, did you just call me a flattie? You just flat-shamed me!
Yeah, I'm a flattie and proud of it, you globetard.
by Spellking August 24, 2017
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