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1.
-noun.
1.The thin layer of beaver lining that magically appears while reversing out of a tight pussy. This phenomenon is only visible while long stroking in the doggy-style or reverse cowgirl position.

2.A tight little beaver that develops a vacuum and shows it's inner lining repeatedly during a thorough plowing.
She must have had atleast 2" of cunt roll-out while I was banging her from behind! The pussy was hella tight!
by Wellseasoned March 19, 2010