When a fat bitches back is more shapely than her ass, and her body resembles an apple placed on top of a hot dog. Also known as muffin top, or nasitall (no ass at all).
"that chicks ass is concave. no, wait, that's just back ass."
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To perform a task in an illogical fashion.
Instead of Mary signalling before turning into the parking lot, she decided to be back ass and signal after completing the turn.
by signull July 4, 2006
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A road that is not simply a back road, but one that is so deep into the middle of nowhere that it deserves the word "ass" in between.
"Where you at?" "I dunno, some back ass road I can't believe I have service."
by I'll be damned June 21, 2009
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a mix of swear words one screams at someone or something, perticularly when frustrated or livid. Often used in uncivilized conversation between two or more people.
Do you know how much of a back-assed-mcdick-bastard you are?
by ~Kat~ December 13, 2010
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The extra skin that shows above the pant line when a female wears pants that are too tight.
Eww, look at that chick, She has pre crack back ass fat.
by SlickSista August 6, 2006
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The act of readdressing an issue or task after you thought it was already finished.

A metaphor: Taking a crap and then having to pull the poop out of the toilet and stuff it back into your butt.
After six months of work on this project, my boss signed off on it. Now its two weeks later and we find out that we were working off the wrong specification. So now I've got to go stuff shit back into my ass.
by Pancreas100 February 8, 2007
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phrase.
refers to an unknown area. the opposite of the common phrase "i know it like the back of my hand". Originates from the fact that most people (unless they are porn actors/models) are quite unfamiliar with the backs of their asses.
Joey: oh look that chick lives in Ismay, Montana. I know that place like the back of my hand. I'll get laid for sure!

Tommy: shit, I know it like the back of my ass.
(walks away defeated...)
by RedDan69 February 2, 2011
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