1) female form of "cock blocking" 2) the act of hindering, by whatever means, the chances of another female from getting a sexual encounter with a male.
**Not to be confused with the class of medications used to relieve chest pains, antianginals**
Cindy: can you believe that bitch just took that hott guy away from me?!
Martha: i know!...she just prescribed you an antivaginal.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"