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It's when you put a glass plate over your face and a girl sh*ts on it!
Boy: Let's go glass plate behind the tree.

Girl: Nah, maybe later.
by haNd1287 April 21, 2004
A sexual act in which one person lies underneath a glass coffee table while a partner takes a dump on the table.
Don't go in that place on Kearny Street with the "nastiest videos in town" sign. They got glass plating in there.
by 19 Polk December 01, 2004