From Rap Dictionary
- To crash the gates of a show with a pack of people, in the hope to get in without having to pay. Yo! Bumrush the show -- Public Enemy (Yo! Bumrush the show) .
- To get beaten up by a large, angry group of people. Literally to get rushed by bums or lowlifes.
- a gay gangbang (Yo that guy got bumrushed by 20 dudes at once when he was in jail)