An abbreviation for the term "Grimy Dawg." This phrase is most commonly used in the restaurant business to refer to any customer who is rude, obnoxious, needy, asks to sit in a "boof" (booth), asks "what kinna juice u got?", and/or does not tip well.
Diego: "Yo man, that table ran me around all night long and left me $4 on a $90 tab..."
Tim: "What a bunch of GD's!"
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