The word flapper is used to diss gang members from sanferndo in the San Fernando valley

Any time you have a booger in your nose and you can feel it move back and forth every time you inhale and exhale.

a saggy vagina that hangs down normally smelly and wet often claps while girl runs

someone who opens his/her mouth to much and sez a lot of bullshit
someone who constantly lies about getting laid or something he/she didn't do just to fit in with friends/people
bean shooter

a compulsive liar. they lie or " flap " about everything, to make themselves look cool. Johnny Dee is a flapper.

Someone who panics easily.

A girl who gets rammed alot so when she queefs, her pussy flaps.