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2.
The thick film that forms upon one's ass (usually of a clear color). If not removed regularly, it can lead to dirty underwear and foul smell.
Big Black wants you to write your name in his booty plaque, you dirty girl.
by Big Black Booty Plaque January 23, 2008
 
1.
A commemorative or identifying inscribed tablet listing the names of women's bootys one has enjoyed.
Yo, see that fine honey, the one that's stacked? I just rubbed her booty, her name goes on my booty plaque.
by Baller and Player May 14, 2008