1.noun. derived from the old english 'festival of slop'.
2. mcdonalds, burger king, taco bell, wendys, pizza hut, jack in the box, hardees, 7 eleven, kfc, country buffet, or any similar fast food establishment.
Q: where would you like to dine this evening darling?
A: i only gots 5 bucks, so it will have to be the slopfest.