When you are doing The Cup Song on your boyfriends ass and suddenly he farts in your face. The fart must contain a large amount of bass and it most be long in duration.
Omg, yesterday, I was doing The Cup Song on my boyfriends huge ass and he did the Shakweave.
I was playing with my boyfriends butt and he did the Shakweave on me.
noun - A traveling wave of notoriously contagious laziness, generally initiated by one or more lazy individuals who act as a catalyst for a chain reaction of sham.
Currently, a shamwave in the vacuum of space is the fastest object in the known universe.
Bert: "Man, I don't feel like working today."
Jared: "Yeah, Dan started a shamwave early this morning so we're all going for beer at lunch, you in?"