1) Punk Rock-dancing in the "mosh pit" - bumping / running into other fans in front of the stage in a counter-clockwise, circular,
semi-rhythmic fashion.
2) To hypodermically inject illicit
drugs such as
heroin, cocaine, methamphetamine, etc.
3) Punch someone very hard.
1) Dude, you can't slam to Pearl
Jam!
2) Dude, I
don't slam that shit, I'll snort mine...
3) Dude, I slammed that
asshole!