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A slide whistle is a blowjob, specifically a blowjob given while manipulating the balls to increase pleasure. This is analogous to using a slide whistle where the person blowing the slide whistle will pull on the slide to change the tone of the instrument.
Nate: I offered the guy next to me a slide whistle so he would watch my stuff when I went to the bathroom.
by TesticularCancer November 24, 2014
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