When one does a multitude of actions, most of which being extremely foul, rancid, and disgusting. Most consist of expelling the green slimer goo from the Ghostbusters franchise
Guy 1: bro last nights party was awesome!!
Guy 2: I dont know about it man. Sarah memed all over the couch.
Guy 1: what does that mean?
Guy 2: Memeing defined is when one expells green or white goo
Guy 1: well in that case, she wasn't the only one
1. It means when a large event has/will/will later take/taken place.
2. Its said after someone does a big win
Guy 1: "Bro after the sleepover, we gonna head to the mall and watch sonic 2... IN A PRIVATE MOVIE THEATER"
Guy 2: "BOOF MOTHAFUCKA!! SNOOCH TO THE MAX!!"