Flat Ass

Also known as Jeong Yoon oh or Jung Jaehyun. Someone needs to give him cake cause everyone knows that he doesn't have one. Jaehyun is the king of all Flat Asses.
Heres how you would use it

Random person : Whats a Flat Ass?

Czennie : A flat ass is someone without cake also known as Jung Jaehyun.
by sochenle April 03, 2021
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Flat ass

A very flat booty. Usally people with one either hate themselves or think that they don't have one.
by Darkshadowstorm March 29, 2019
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flat ass

Having no ass or junk in the trunk. Suffering from the vitamin deficiency Noassitol. See Glutius Flatosis.
Heather's flat as was the result of Glutious Flatosis.
by DzNutz January 20, 2004
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flat ass

Blunt honesty, absolute truth bare of cushioning social niceties

Derives from the impossibility of reassuring a person with insufficiently pleasing buttocks
Q: Do these jeans make my butt look big?
A: Girl, no jeans in the WORLD gonna help THAT flat ass!
by Kindly Wise October 23, 2005
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flat ass

A twenty-first century version of the secretarial spread, caused by passing long hours planted in front of a computer. Also related to phone ear.
"I have to get a better job. I've spent the entire day just sitting on my flat ass, staring at that stupid screen."
by Deb1955 October 23, 2005
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flat ass

Of or pertaining to geniune truth. That which is true on the basest level.
I flat ass couldn't afford a doctor.
by kcardk October 15, 2005
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flat ass

A re-working of the expression flat out. Ultimate or distinguished from others by a high concentration of the quality expressed
She is flat ass beautiful
by morie October 23, 2005
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