A Tweaker, Crytal Addict. Someone who smokes, or sniffs Crystal Meth.
Dude you're Boy is a Shwamper.What's up Shwamper!Ay bro you still Shwamping?
Having a girl go down on a guy, ie., a Blow-job...
I got some good ol' shwampers from my girl last night in the back of my car.