When a G exchanges one thing for another thing of lesser or greater value.
Like when a gangster robs a familty and comes up on some DVD's. He goes to the video game store to TRADE UP on them for some other DVD's or store credit.
verb, to dump your current relationship for someone who is younger, better looking, smarter, has more money, has bigger tits, or a bigger dick, with no kids.
Pud: Hey Rick, who's that you're with? Where's Tracey?
Rick: I cut that chick loose so I could trade up with Veronika.