Top Definition
The moment during vaginal childbirth when the baby's head first emerges from the vulva resulting in a "Collar-O-Giner"!

The vagina forms a collar-like apparatus.
"Nowadays it is fashionable for baby's first turtleneck to be suede-like but during the 70's, the style was Angora!"
by GOFS February 04, 2010

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