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!