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"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 real Fanny Gasher."

"To be honest he's a bit of a Fanny Gasher."
by Fannygasher16 June 15, 2018
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