short for "percolator" (I could be spelling that wrong). A perc is an additional chamber in a bong, and its purpose is to make the hit more smooth. Bongs can have multiple percs.

short for the narcotic perscription drug percoset or any one of its forms such as oxycodone or oxycontin; makes you feel warm, happy, and relaxed. highly addictive, people not only swallow the pill but take it orally crushed (for a faster reaction) or snort it.

Slang for the perscription drugs Percocet or Percodan, which is an opiate or painkiller, commonly used recreationally for its euphoric effect.
Ironically, Percocet is an opiate, which is a nervous system depressant, and the slang term perc cannot be verbally distinguished from perk, which means to make more alert or active.