Top Definition
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 little ass he is, Jonny yelled a "flapnut" during his gramdmother's funeral and shit his pants in the excitement.
de God 19 mars 2003

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Derived from an ancient "nut-flapping" ritual in Eastern Cambodia. The young boys would yell out "Flapnut!" when the men with the wooden clubs, would "flap" their "nuts" every sunday at 11:38 AM. It has now evolved into an exclamtion of annoying distraction.
When little Billy broke his mother's favorite vase, he threw a fluster of papers and coffe filters into her face and yelled "FLAPNUT!" and escaped before his mother got to him with a the rolling pin.
de Alexei 19 mars 2003

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