Top definition
When a female uses a vibrator so powerful it causes the vaginal lips to slap each other causing the lips to make a "fart" sound.
Sarah: hey Jen did you use the penetrator 6000 last night?

Jen: yeah it literally caused me to fart flap it was hilarious.

Sarah: oh Jen you love abit of fart flapping.
by nipsmandem May 18, 2014
Get the mug
Get a Fart flapping mug for your bunkmate Georges.