An individual who practices deciet, breaches confidence or is unfair and dishonest against another must be punished by way of physical retribution. Was essentially first coined on the TV show 'Curb your Enthusiasm' by Larry David's co-star Leon.
Quoting from Curb your Enthusiasm

"Leon: When a man calls you a fucking faggot, you get in that ass Larry, you know what i mean? You get in that ass Larry.

Larry: What are you talking about?

Leon: You let a man slide today, you must immediately get inside somebody's ass when that happens to you. You pull the asshole open, step into the asshole, close the door behind you. Then you take a spray can right, spray Larry was here, wash me all that shit, fuck his whole asshole up. Get a snickers bar, paper, throw that on the floor, fuck his whole asshole up. Then you open up that asshole one more time, step out his ass, then leave that motherfucker wide open so he know you've been there."
by RoninR August 4, 2009
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A term used to to express encouragement.
Get on that ass, man.......
by Maggi_L July 10, 2010
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Confronting the male head on. Face to face contact with a male
I know that muthafucka was sneaking around, so I had to get in
his ass.
by Dee Wright August 5, 2003
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means to say stop yelling at me, like when your wife is yelling at you and you just want her to forgive something stupid you did
"honey im sorry i forgot to take the trash out, i will do it now, please get off my ass!"
by steveocanadian September 14, 2011
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When something annoys you
When people chew with the mouth open it gets up my ass
by Avaandlaoise.45 July 12, 2019
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Verb: A phrase which means when you get your hands on someone, followed by what you're going to do to hurt them.
Prize Fighting Champion: "I'll tell you what, big guy. When I get that ass, I'm going to tear it up with my bare hands so thoroughly, nobody will be able to tell whether you were a human or a pile of food."
by Gohan Barracuda August 23, 2018
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