The black, mushy goo left in the bottom of your glass after dipping oreos (regular or double stuffed) into milk.
Austin: I just ate a whole box or oreos!
David: Did you dip 'em in milk?
Austin: Well duhh.
David: Dang that must have made a lot flup!!
Austin: Chyeah it did.
© 1999-2015 Urban Dictionary ®
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