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A blood comet is a substantial clot of congealed menstrual blood that forms a comet-like shape in the toilet upon ejection from the vagina. There is always a head-like structure, with some manner of tail, sometimes long enough to swirl around the circumference of the bowl.
"Guys, I made the biggest blood comet in the toilet just now."
by Dr. Moneypenny Esq. April 28, 2014
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