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Term used by non-native english-speaking Asians when in doubt of the meaning of something. ("What does that mean?" in regular english). Must be said with an Asian accent.

Coined by Covino and Rich on MAXIM Radio.
Back in the day, which was a Wednesday, Covino had an Asian classmate named Chu who didn't understand any slang due to the fact that he didn't speak english very well. Anytime slang was used, Chu would say, "What dat mean?".
by C&R Fan umbepo October 29, 2006
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