What is Open Up?
1.
1) To open and unpackage something, generally for the first time.
2) To operate a motor vehicle in a spirited fashion.
3) To commence, or return, fire at a person or thing.
1) Hey, let's go open up that new PS3.
2) Yeah, just a few minutes ago, we had 'em opened up out there on Redwood.
3) Why don't we take the 1911 out and open up on some bottles and cans?
See
2.
when a girl opens her legs exposing her pussy
Yo last night I told her to open up and I tore dat pussy up!
See
3.
To open up, as in to stab/knife someone.
The opening process can be as simple as a minor poke but generally involves heavy bleeding and multiple openings. The more insane openings consist of using your bear hands/fingers to perform the opening process.
"I finna open you up like a damn can-o-tuna, you fat slut ass biotch."