One female impedes sexual success of another female. Similar to a cockblock; but the sexes of a participants are reversed.

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When a man tucks his genitals between his legs to pose as a female, then exposes his genitals revealing to any viewers the horrible truth.

A muff-bluff is a situation in which a man or woman falsely assumes or is even tricked into believing that a woman would like to engage in sexual intercourse. The term is derived from the slang word muff or muffin (vagina) and the gambling term "bluffing." While a "muff-bluff" is the noun form, there is there is also the verb form "muffin' bluffin'."

when one chick prevents another from getting laid by moving in on thier man/woman. same as a cock block but with girls.

When a girl fakes an orgasm, she is bluffing her muff muff.