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To wash out your nostrils. Kind of like an enema, but at the other end. It's an old cultural practice of the Aztecs that's getting a revival.
We used to call this dude Colnel Bogey behind his back until he started to yacapaca.
by Buzzcock March 15, 2006

Words related to yacapaca

aztec bogey honker nose paca septum shnozzle snot yaca yacatl