Urban/hip-hop meaning for anal sex. When a sista sits down on the lap of a man so that his penis goes into her booty hole.
Sit The Ass, as in "Let me sit this ass on you"...Beyonce in Rocket
by omjo34 July 08, 2019
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sit your buttox onto a surface area.
John: Hi Josh.
*John gets out of his seat*
Josh: Sit Yo Ass Down.
John: sorry.
Josh: Don't feel sorry for your self ura bitch.
by Superdupperjohnb February 07, 2008
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to have partied to hard to the point where you are to sick to continue the party. To sit your ass on the grass refers to having bit off more than you can handle while partying, and being unable to party anymore.
Ex. 1 - Man I had to sit ya ass on the grass the other night you went to hard on the alcohol.

Ex. 2 - I sat your homeboy on the grass the other night, he thought he was tough enough to hang with the big dogs.
by rollicasspeindeks October 02, 2011
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A phrase used to chastise someone for being happy about something they shouldn’t be happy about. Usually comes with a catch of some kind.
“The Giants WON!”
“It was against the Buccaneers and even then it was just barely, SIT YO ASS DOWN.”
by TwinFami November 18, 2018
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(V.) sitingass-

the act of doing absolutley nothing. sitting on ones behind (or ass) instead of doing somthing productive, such as going out at night, going to work, or simply moving ones pathetic body from their couch.
used in a phone call...

JOE: hey jimmy what are you doing?
JIMMY: nothin man, just sitting ass, you?
JOE: you know im sitting ass.
by Jmac Jimmy July 29, 2006
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