from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. To knock against others intentionally while dancing at a rock concert; slam-dance.
- transitive v. To knock against (someone) intentionally while dancing at a rock concert.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To dance by intentionally jumping into and colliding with other, similarly behaving dancers, and performing other wild, aggressive, or spastic movements.
- v. To intentionally jump into and collide with another, similarly behaving dancer at a concert.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. dance the slam dance
Perhaps alteration of mash.(American Heritage® Dictionary of the English Language, Fourth Edition)
Possibly an alteration or deformation of mash. (Wiktionary)