Top Definition
A creature who sexually preys on his/her friends during periods of birthday celebration. The beast feeds off the insobriety of the birthday goers and lures them back to its velvet lined den where it performs a gruesome yet mesmorising dance which selectively paralyses all but the intromittent organs of the individual. The Sex Yeti wields no physical weapons but uses more deceptive methods of persuasion; luring pheromones and the deception of physical arrousal.
1) "Oh no here comes the Sex Yeti! Quick everyone hide the women and children, get the dogs and pitch forks and cut off your genitals!!!"
by Ebobs May 11, 2010

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