A quote made famous for its use in season 1 of Supernatural. Implies that the driver of a vehicle chooses what music they and the passengers will listen to while whoever is riding shotgun must stay quiet.
Sam: You gotta update your music collection. Black Sabbath? Motorhead? Metallica? It's the greatest hits of mullet rock.
Dean: Well, house rules Sammy. Driver picks the music, shotgun shuts his cakehole
Common beginning or ending to a sentence. It can serve to:
1. provide an excuse for why one has not yet done something.
2. suggest a vague intention of doing somethinglater (similar to how Spanish speakers use the word "mañana.")
3. add minimal credibility to an idea that is a pipe dream.
1. There's no point in looking for a job until the economy picks up.
2. I'll start my business when the economy picks up.
3. Unemployment levels will go back down to the levels they were in the late 1990s when the economy picks up.