Not being a team player. A selfish act where what you're doing is helping (ie: feeding) yourself or the enemy, either on purpose or by being a noob, sacrificing the entire teams potential.

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)

A term in team-based video games used to describe someone who is not playing with the team and/or is playing selfishly. This person will usually stray away from the team/objective in a match. The enemy team will be able to take advantage of this situation by either being able to kill the "feeder", or pushing towards the objective while the "feeder" is unable to help. The word originates from games where special abilities can be obtained through dealing damage. If a person is getting damage dealt to them constantly, they are "feeding" the enemies ultimate.

When you're playing League of Legends and your teammates go 0/10

The act of not being nice after you rape a girl.

Eating at an uncontrollable rate. Usually done when High.

In a rap battle, feeding is when you make your opponent eat their own line - you use it against them, or flip it on them.