bu-n
When arms are spread exactly straight and level to the sides, while running or otherwise in motion, generally so as to pretend to be an airplane.
The name comes from the onomatopoeia of an airplane flying. It is also a nickname and catchphrase of "内藤ホライゾン" (Naitou Horizon), an ASCII Art character. He is a mascot for 2ch's VIP board.
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This tag implicates spread_arms (learn more).