female equivalent of a 'stiffy' or hard-on and ONE of the ways in which a lady-boner manifests, the moisty is simply referring to the moisture that occurs when a female is very pleased to see someone.
Cinema attendant to last female to leave the theatre: "Miss the movie is over. Can you please leave? I need to clean up before the next session."

her: "I would like to but I am stuck to the seat."

him: "Ah I see. The same thing happened to my girlfriend once."

her: "Yes. It's Daniel Craig as 'Bond' you see. Gave me a moisty of epic proportions."
Get a moisty mug for your cat Trump.
A highschoolish-aged girl who is 1) attractive and 2) horny.
Dudez, you meet the new girl Karen? Christ she's a moisty.
by Bruno November 09, 2004
Get a moisty mug for your mate Riley.
'Babe, I'm really horny'
'Oh yeah?'
'Yes, feel my moisty'
by hootiegirl January 30, 2007
Get the moisty neck gaiter and mug.
Females between the ages of 18 and 25 who is down for anything.
This party is a total Sausage Festival where are all the moisties?
by scottfilly November 28, 2009
Get the Moisties neck gaiter and mug.
A LOT of grease, very moist to touch, a name you can call your very moisty friends.
rose is such a moisty.
by lauren_camp April 20, 2018
Get the moisty neck gaiter and mug.
moisty: A female that is younger then you that you believe is very attractive.
16y.o Tyson calls 15y.o rachael hot, meaning he thinks shes a moisty
by Tim Worcester October 16, 2005
Get the moisty neck gaiter and mug.
A Moistie can be compared to that of the similar definition Stiffy, but in relation to a woman. generally the fluid is in a similar volume to Niagra Falls.
When I see Ownes Stiffy, I get a moistie that is in a similar volume to Niagra Falls.
by jbbjshlws November 24, 2008
Get a Moistie mug for your Facebook friend Zora.