Tilted - What does tilted mean in online gaming?

Tilted is slang for "Aggravated." See an example of how people use it.
A player who is tilted is angry and, as a result, making game mistakes. These days, poker players most commonly use the term tilted, to describe players who are playing sloppily because they're salty about previous losses. However, tilted originated among pinball players.

TILT definition in American English

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