1)Red cactus is a slang term for vaginitis, a redenning and inflamation of the vagina. Red cactus, like most slang, can be used to degrade or embarass someone.

2)Red cactus can also be a term for a whore or prostitute. It can also be used to dicribe a woman that is "An easy fuck" or someone that you can get to have some sort of sexual intercourse with you because of the possibility of her having a vaginal disease suck as, previousely mentioned, vaginitis.

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