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A sexual act, performed during an orgy and similar to a human centipede, in which an absurdly long dildo is inserted into one person's anus so far until it exits the mouth, after which it continues into the next person's anus and so on until everyone is skewered.
Person 1: 'Hey, are you gonna be at the party next week? We're gonna be doing a human centipede on a stick.'

Person 2: 'Steve, what the fuck.'
by martin4132 March 06, 2017
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