Taken from Wikipedia.

Tilt is a poker term for a state of mental confusion or frustration in which a player knowingly adopts a sub-optimal, over-aggressive strategy.

Placing an opponent on tilt or dealing with being on tilt oneself is one of the most important aspects of poker. It is a relatively frequent occurrence, due to frustration, animosity against other players, or simple bad luck. Experienced players recommend learning to recognize that one is experiencing tilt and to avoid allowing it to influence one's play. However, putting one's opponents on tilt is a remarkably effective way to win at the poker table, albeit one that isn't going to win many friends.

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I hate virgin entries.