1. (v) The act of removing the contents of someone's backpack, turning it inside out, and re-inserting the contents into the inside out bag, usually during class.
2. (n) The victorious exclamation often proclaimed after a successful Punk Nasty.
3. (var) Funk (or Dunk/Chunk) Nasty: A variation on the Punk Nasty in which the assailant uses the Punk Nastied backpack as a fecal receptacle (ie takes a shit inside it).
1. "Damn nigga, you just got yo sorry ass Punk Nastied!"
2. "PUNK NASTY!"
3. "What the hell is that smell?"
To punk nasty someone is to take their backpack, remove the contents, turn the backpack inside-out, replace the contents, and then zip it back up. To double punk nasty a pair of people, one punk nastys each person, but swaps the contents of their packs.
"Go get Liza's backpack, I'm going to punk nasty her"