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!