tv. & in. to expose the buttocks (at someone), usually through a car window; to moon. : Victor gauchoed the cops as they went by.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
gaucho
1824, from Sp., probably from a native S.Amer. language, cf. Araucanian cauchu "wanderer."