punking

1. a male prison inmate fucking another male prison inmate in the ass 2. succesfully playing a practical joke on someone Originally, the word "punk" was prison slang, meaning the first defintion. the second comes from the idea that fucking someone in the ass is a sign of disrespect (such as male dogs humping one another to show dominance, instead of sexual attraction, which could very well be the motive behind prison rape as well)