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To prepare and or raise one’s ass up in position for anal sex.
Ok baby, it’s time to ass up.

She was ass up and ready to go when I walked in the door.

Let me run to the bathroom first so I can ass up. I’m a little dirty down there.
Ass Up by Eaton Holgoode February 5, 2018
the more vulgar form of shutup now.
bob:didn't you say you'd pay me back today???
ann:no, i sed tomorrow
bob:liz, didnt ann say she'd pay me back today
liz:umm...yea...she said that to me too
bob:i'ma need your broke ass to pay me back...now ass up.

*note-ass up can also be said as ass the hell up to add more emphasis to the fry or burn that just took place or it can be said as ass the fuck up to add EVEN MORE emphasis and make sed fry or burn even more epic...
just have fun with it
ass up by pootytrained February 10, 2009
To trip over something or fall over in such a way that it temporarily results in one's rear end being at a higher altitude than one's face.
I tripped over a cable and fell flat on my face. Totally went Ass Up.
Ass Up by MeepusMaximus January 1, 2020
Behavior characterized by boastful or proud display of one's most loutish, childish, or in your face traits in public. Also, any advertising, television programming, or music intended for consumption by such persons.
I don't wanna go there, that restaurant caters to the ass-up crowd. The movie we saw was totally ass-up. My coworkers were being so ass-up that I just clapped on my headphones and cranked the music.
ass-up by Dawnera September 4, 2006

ass up cock tail party 

suprisingly similiar to a british tea party. these partys usually consist of a wide variety of people normally from in or around your neihborhood. All getting together for a couple of hours. party consist of massive amounts of alchol(beer, wine, and mixed drinks). Every body is getting freak nasty in the corner, by the pool, maybe even on your couch, god forbid on your bed. but this has been known to occur. The sexual act of choice is the ass up, cock out approach in which the guy procedes to fuck the female from behind. when everyone is good and ready or your party is being broken up by the cops because you ended up fucking your neighbors wife. caught in mid stride by the jeolous husband. you and your neighbors go each your own way. until the next ass up cock tail party.
holy shit last nights ass up cock tail party was fucked up. i didnt know that bitch was my neighbors wife. but i got to give it to her she can ride a dick like nobodys buisness.

tear that ass up 

To have rough sex with a girl.
Devonte: Shanika looking fine in them sweats
Jerome: Boy, I would tear that ass up!
tear that ass up by Pizzlej April 18, 2020
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Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
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