The act of going for a knife kill in Call of duty while you and your opponent are face to face, and at a small distance. It goes against "never bring a knife to a gun fight" but please believe, its very effective.
This term is used a lot by the great xcalizorz.
"Oh no this guy is shooting at me!!" (runs around corner and switches to ballistic knife)
"Can I for the bro rush?"
(Enemy comes around corner after him) "Bro rush, BRO RUSH!!! (knife kill) YEAAHH!!!!!!!"