the telltale sign of a previous ejaculate. usually more noticeable on dark fabric especially napped fabric such as velvet, velour, or corduroy.

On lighter colored fabrics, the use of an ultraviolet light will help a cum spot come to light, so to speak.
Dick, did you leave a cum spot on your sister's bedspread?

-or-

Harry, I just got my prom dress back from the dry cleaners and you can still see the cum spots you left when you gave me the pearl necklace in the teachers' lounge.
by Cecil Megaphigitz October 31, 2009
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