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To beatbox while playing the flute.

Innovators including Nathan "Flutebox" Lee and Greg Pattillo perform in this manner and have elevated the art.
"I just found out that my friend can flutebox!"
by firecube November 12, 2013
crass Slang for a womans Vagina often used as a metaphor for saying your going to/ would like to have sex with a woman.
"I'd like to play her flutebox"
by ribsanimaniac April 11, 2009