A clever phrase to let chums know how thouroughly annoyed you are with them at any given moment. Most effective when cleverly hidden in an unexpected place, in a seemingly unrelated sentence. (See example below.)
Chum: Man, did you watch that special they had on dateline last night? The one about Lynyrd Skynyrd? That was really cool.
You: Yeah, it was pretty sweet. Almost as cool as SHUT THE HELL UP!