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1.
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.
door DzNutz 20 januari 2004
 
2.
Of or pertaining to geniune truth. That which is true on the basest level.
I flat ass couldn't afford a doctor.
door kcardk 15 oktober 2005
 
3.
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!
door Kindly Wise 23 oktober 2005
 
4.
An ass that is flat,noncurvaceous. Common among Asians.
Look at that flat ass! There's no meat in there!
door Bobby De Niro 5 januari 2006
 
5.
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."
door Deb1955 23 oktober 2005
 
6.
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
door morie 23 oktober 2005
 
7.
An insult normally directed at a fat girl wearing tight clothes aiming to make the most of her assets. This girl normally possesses the required saggy jelly tits in an undersized bra, saddle bag thighs, extra wide hips and a balloon belly gut, however her back tends to run directly into her upper thighs without so much as a ripple. Giving the impression that her lower body is the wrong way round.

This insult should be used carefully if the intended target is within earshot and of African descent as you will probably become the victim of a violent assault. Directing this insult at a Caucasoid female is a lot less dangerous as it may be taken as a compliment.

Other noted recivers of this insult are:

i)Skinny girls. Ususally wearing very big or string type belts in the hope of creating a feminine figure

ii)White guys. Who reputedly all have a flat ass, even the fat ones.

iii)Black guys. Displaying the opposite of the Arsenio Hall afliction
The scene: A club dance floor.. a DJ spins Baby Got Back and the more ample figured ladies stampede to the dance floor. Two friends who narrowly missed being trampled take refuge in the corner and watch.

Friend 1 turns to his buddy and observes "look at that flat assed hoochie mamma trying to shake what she doesn't have"
door jasonlondon 3 augustus 2006