When your vagina gets too dry for sex after smoking weed.
Very similar to "cotton mouth" (lack of saliva) but affects the vag in the same manner.
A) "sorry babe I'm not up for sex at the moment... Cotton vagina problems"
B) I am hesitant having sex after smoking a fatty with my boyfriend... No matter how turned on or stimulated, the vagina refuses to wetten sometimes after a huge smoke sesh. Which sometimes can lead to a rather unfortunate amount of friction