A women of the 20-30's. Often wore short 'flapper' dresses with tassles or beads. Had their hair in either short bobs or curly. Fishnet stockings and head pieces were worn. Flappers usually wore a 'mole strap' and the man the she 'belonged' to had a matching tie.
Oh damn, that flapper is with that guy over there.
One who does a lot of trash talking and will not cease under any circumstance. This includes trash talking in place for another person. Mainly used and associated with competitive activities such as sports, video games and primarily street racing. The action of flapping can also be performed simply by flapping ones hand or sleeve.
Devon is flapping to the Audi driver because his Honda is faster therefore he is a Flapper.