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1.
A Singing Susan is when during sex, air is trapped and compressed inside the vagina and upon subsequent entries by the man's penis, the air is compressed to the point where it forcefully exits the vaginal canal to relieve the pressure. The sounds of the air rushing out is principally the same as the familiar queef. While a potential source of embarassment for the girl, the gentleman can rest easy knowing the size of his johnson was the most likely cause.
While having sex, the man's unit continuously traps and compresses air until the woman's pussy sings a short tune as air rushes out.
The lady thus committed a Singing Susan.
by Rew Nelson May 20, 2008
 
2.
A Singing Susan is when during sex, air is trapped and compressed inside the vagina and upon subsequent entries by the man's penis, the air is compressed to the point where it forcefully exits the vaginal canal to relieve and equalize the pressure. The sounds of the air rushing out is principally the same as the familiar queef. While a potential source of embarassment for the girl, the gentleman can rest easy knowing the size of his johnson was the most likely cause.

While having sex, John's unit continuously pounded Jessica's pussy until it sang a short tune.
Jessica thus committed a Singing Susan.
by Rew Nelson May 22, 2008