Acronym for "Politically Incorrect Firearm". Firearms that are currently considered to be socially unacceptable to own.
"The Obama administration is moving forward with their assault weapons ban. Civil rights supporters call this a ban on PIFs, or politically incorrect firearms."
Short for Epiphany. While sitting around getting high with your friends the one dude that is always super inteligent when he is smoking says something like.
"Yo I just had an a-PIF-a-nee..." This isntantly made everyone leap up and say what? Pif-a-what? This must be good weed this muthafuka just said PIF-a-nee.