2.(v) to attack in force, to use in force
3.(v) to raid (As in pillage/common tatic in online games)
2. Danei's missiles bumrushed the enemy MTs.
3. A common tatic in Starcraft is to bumrush your enemy with Zerglings, lots of them.
Gay guy #2:Yeah, he is soo hot. I'd love to bumrush him.
2) (v) To get beaten up by a large, angry group of people. Literally to get rushed by bums or lowlifes.