
EMILY: Lorelai, there you are. You’re late.
LORELAI: Well, you scheduled this beer bash during rush hour.
A beer bash is slang for an informal party, often organised in the context of a university or office social event. It seems to be used particularly in Commonwealth countries like Canada, and doesn’t appear to be common in the US. Emily doesn’t rise to the bait of having her corporate event described as a ābashā.
Rush hour, the name given to the time of day when traffic is heaviest, the times of day when most people are going to or from work. Unlike its name, it usually lasts more than an hour, and far from rushing, traffic is generally slow.