Definition

The muddy, crushed residue of Oreo cookie crumbs mixed with saliva, typically visible on teeth or around the mouth after eating them. It's basically the evidence of your cookie crime.

Example Usage

You've got Oreo Sludge all over your face—brush your teeth before your meeting.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Oreo%20Sludge&defid=2709807)

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