For a woman to stand legs apart or even legs akimbo and swinging her hips side to side. So called because this movement can cause a woman, usually an older one, to produce a flapping sound as her lips hit eachother.
Egad!!! Marjorie is flapping on the dancefloor!
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What people say when they aren't too sure what someone's talking about
"I just bought a turbocharged chemical-stabilised pressure cooker"
"Thewhatnow?"