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1.
French word for a platform in a station or a quay. It's not a slang word.
il faut attendre que le train soit arrêté pour descendre sur le quai. (you must wait till the train stops to get off on the platform)
by truefrenchgirl June 18, 2005
 
2.
It can mean almost anything. Insert it into your everyday speech whenever it feels right.
"That was very quai of you."
"That's quaied up."
"Quai?"
by Vincenzo January 25, 2004