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1.
The dry-mouth sensation that spreads through the vagina (oochie) because of over absorption of the tampon.
"Dammmn Meredith, Have you ever had cotton crotch"
"No...what the heck is that TRISHA?!"
"You know, when your crotch is all dried out when you have your period"
"Wow, must be an itchy week."
by Trisha DUDETTE March 06, 2006
 
2.
A dry snatch.

Some chick that gets so stoned that her cotton-mouth extends to her cunt. This is observed during an attempt at sex that wasn't meant to be.
I was so horny after we smoked , but my cotton crotch was a real cock blocker!
by ThatGurl07 December 26, 2010