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A high-fifteen is a high-five used whenever three guys simultaneously want to give each other high-fives. To employ the use of the high-fifteen means that none of them has to feel awkward and left out while he stands there watching his two friends happily high-fiving one another before he can do the same.
By the the time Eddy and I had finished high-fiving, Bill had lost his excitement and even though he still high-fived me, I could tell his heart just wasn't into it. We should've used a high-fifteen instead.
by sloppy bushwhacker September 27, 2009
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