1) Nust swinging, (flapping) in the breeze
2) A lost homeless person in San Francisco 3) (Most common usage) An exlamatory exlamation exclamed to large groups of people at inappropriate times, usually during a long silence
Being the littleass he is, Jonny yelled a "flapnut" during his gramdmother's funeral and shit his pants in the excitement.
a dumbass kid who likes to use the words 'ghey' and 'owned' to their maximum capacity. He wants to be a ninja, but just ends up giving into his urges for pirate style ass sex.