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1.
to bag it up means to wear a condom
boy 1: I was at some dirty thing last nite

boy 2: nice one boy, did you bag it up?
by rootthetoot January 09, 2007
 
2.
To affirm agreement or enthusiasm for an idea.
Dude #1: "Dude, we should get some weed and watch C-Span"

Dude #2: "Fuck yeah! Bag it up!"
by Willie Cornbread August 05, 2007
 
3.
to fuck a girl, don't matta if you use a jimmy hat or not, it's nothin to do wit dat. It's hittin da pussy yo
"I like the way you work it, I'd like to bag it up."
by JaayDub April 25, 2007