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.
by Eaton Holgoode February 5, 2018
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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
by pootytrained February 10, 2009
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Angry to the point of no return,usually with the outcome ending in great violence to the one who has given you"a case of the ass" to begin with.
That f#@*ing Sam has got me all assed-up over not paying me my money!
by WORSETHANSATAN September 13, 2003
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Heather got so assed-up in the meeting that she broke a nail.
by Thuggery August 30, 2005
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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.
by Dawnera September 5, 2006
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Tight jeans shorts that dig up in a shorty's ass.
Her booty is looking fly in them ass ups.
by Neno Brown August 16, 2007
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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.
by MeepusMaximus January 2, 2020
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