A pussy that has been infected with a STD, that is still on the prowl. This can be any girl who gives out advice like "Don't worry it's cureable" just so she can have sex.
"Man he was still going to hit that bitch with the snatch dragon."
"I rode that snatch dragon last night man, and now I gotta go to the doctor."
"Shit, stay away from that bitch if she gets her snatch dragon on you your dick is going to be burning."