An imaginary flute that, when played, signals the presence of one or more "sloots" (sluty women) in the vicinity. While playing the imaginary flute you may make the sound "Sloo-ta-loo" to let others know there are sloots in the area.
"dude, last night the sloot flutes were playing loud and proud!"
"Sloo-ta-loo!"
by Caseman1000 February 20, 2012
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