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A "glass muffin" or also known as a "swan hole" is a contemporary but subtle meaning for a fragile female genitals. The male will try to inserts the penis into the female's glass muffin, but the vagina will just redden, bleed and shoot out stools.
Hal- Dude Jamie had a freking glass muffin when i was banging her.

Drew- Weak man.....
by SexFace69 April 24, 2010
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