Consensual sex between people who hate each other.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

the act of displacing anger through fucking unbenounced to the other person.

To seriously just loath the person you are having sex with so much that you actually aren't enjoying having sex with them and are instead taking out all of your other frustrations on them. One would usually hate fuck someone who either: is a total bitch, a prude, a whore, or someone who simply looks at them the wrong way and pretty much had it coming.