Nimret is a word rarely used but it is essentially an act of dirty, filthy but delicious sex. It is believed to be one step above that of an orgy. A nimret will usually consist of at least 16 people getting it on in a hot, sweaty room playing Akon's Slap That in the background.
Dude! Me and my buddies were at a college party last night with 15 chicks and we all got high on crack and had an awesome nimret!