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Where 2 women rub and hit eachothers fannys together, usually after they lick eachother out.
my girlfriend fanny bashed me yesterday it was great the way our fannys touched, i was screaming harder faster.
by proud owner of a fanny May 16, 2006
A word of affection between lesbians.

It refers to their sexual antics and their general sexuality.
"Awwh, you're such an adorable fannybash!!"

"Hey fannybash, wanna go for a ride!?"
by adorablefannybash November 02, 2009