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It's when two dudes high-five with their moustaches. To an outsider it might look totally gay, but between the two dudes, it's totally manly. Sometimes followed by heavy groping and actual kissing.
"Moustache Five right now!"
*pound moustaches*
"THAT was AWESOME."
"Yeah! But that part where you lingered was kinda weird."
by Desmond White November 30, 2009
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