"Fanny Gasher" is the perfect phrase to describe when a friend finds out about a clip on Snapchat they werent supposed to see and spreads what they saw minutes later.
It could also mean a male who claims to get a ton of vagina in his spare time, to witch your reaction is quite sarcastic.
"I heard she shoved a toothbrush up her g-spot the other night."
"What a realFanny Gasher."
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.