Occurs when a woman doesn't remove a tampon before putting a new one in, the first tampon goes far enough into the vagina that the string can't be seen. The "rotten cotton" is the actual tampon that was left in for too long. It usually has a foul smell & discharge associated with it.

Likely to be used by healthcare providers who see this patient for vague hoo-ha related complaints and on pelvic exam find that they have a forgotten tampon in place.
Josie left her tampon in for five days and now it's rotten cotton.

Says the nurse to her assistant, "Once I remove the rotten cotton, make a run for it!" (to escape the evil smell)
by Nursey McNurserson October 9, 2011
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Rotten cotton is pussy that is used up but still desirable like a slut who fucks random guys but is still considered a sexy slut.
I want to fuck that rotten cotton.

Yeah, let's just say I like my cotton to be rotten!
by VampireAlex October 2, 2019
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Wiping a cottonball on a sweaty ballsack and tossing it at an unsuspecting victim
I just hit bill in the face with a rotten cotton
by Czszombie March 20, 2018
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