a conversation ender like good day or goodbye
means keep it real or have a nice day
ryan: alright im rollin out
josh: aight man keep it moist
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Basically stemming from, "take that cookie" or "take you're cookie", if someone tells you this, it is like saying, "keep that seat warm for me" but they want you to keep your ass ready for them so when they tryna take it, its nice and soft.
Keep That Cookie Moist for me for when I come back around the block tonight