Top definition
A boy who is constantly hanging out with their girl friend (flap) rather than the boys.
Craving, or texting women (flap) when with mates is also considered a flap boy

The term originated from the Wairarapa, New Zealand and was inspired by Jamie McMasters desire to hang with girls (flaps) rather than the lads.
Examples of Flap Boy include:
Jamie McMaster
Jack Colton
Riley Scott
Jake Ellison
by Louis MH November 27, 2013
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