a) Aerodynamic devices found at the trailing edges of aircraft wings, used to augment lift at a lower speed during takeoff and landing.
b) The meaty lips you love to nibble on when you go muff diving
derived from the fact your heart flaps or flutters when you see you have a message from them.
may be preceded or followed by an X showing extra love or sexual desire
louisa: "whats your new number anny?"
anny: "306771"
louisa: "thanks poppet, ill save it as xxAnnyFlapsxx"
anny: "sweet"