This is a person(usually a woman) who is preventing another woman from getting laid.
This is the equivilant to a cock-block in the female form.
Gina: Hey Rod wanna go have sex later?
Rod: SURE!
Rod's mom: Sorry Rod but, you have to give the dog a bath. You can't have sex with Gina tonight!
Gina: GOD Rod! Your mom is such a SNOOCH!
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