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.
this word is to be used in the sence, "get rid" or "dispose"
joe: yo josh fam, just cartdem man, them guys are wasted at call of duty!
josh: fam i just cartdemmed them off the roof blud!