The sudden act of anal penetration without the victim's awareness.

The act of anal sex between two males, by the person standing firmly behind. While it can theoretically also refer to heterosexual anal sex, bumrush is exclusively used in practice to refer to anal sex between two men. More specifically the tops '''does''' the bumrushing, while the bottoms '''gets''' bumrushed.

To be making sex in the vagina and accidentally slip out and thrust into said bum

1.(v) To blindly charge at
2.(v) to attack in force, to use in force
3.(v) to raid (As in pillage/common tatic in online games)

What happens to a street punk and gansta wannabe in the shower on his first day in prison.

To get beaten up by a group of lowlifes, or bums.

When you get a boner and start running and slam your dick into her butthole causing her to go flying into the wall and crack her head open