In Britain, used to refer to the labia majora of the female vagina. Otherwise known as the vaginal "lips".
Can be used as a derogatory term, in the same way that cunt, dick, asshole would be used.
That chick has huge fanny flaps.
I'd like to wrap my fanny flaps around that guy's cock.
Shutup fanny flaps.
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A competition to see who can flap out the grossest fanny smell
She's the regional champion at smelly fanny flapping, what a whiff worth a sniff
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When vagina flaps are disportportionally large in comparison with other body parts. Flaps are slighyly loose and flappy, and may clap or flap during a fanny fart.
"Warren, was that a machine gun?" "No sally that was just Jenny's floppy fanny flaps".
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when a thong is so tight it looks like there is 4 flaps- fanny 4 flaps
she was dam good looking but she had a fanny 4 flaps
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