A variant definition of the word morp is, since it is prom spelled backwards, what people do instead of going to prom. Such things include playing CoD or Halo all night, going out and having a few beers, or just sitting at home and watching TV. This is generally not a cool thing to do... EVER.
Friend 1: You coming to prom tonight?
Friend 2: Nah, I'm just gonna go morp somewhere.
Friend 1: Dude, that's lame.
Friend 2: Whatever!