A term or description created by a well-known comedian describing a male rear end that has been sodomized. After numerous times it has the look of a Koi fish mouth.
by Esolee3 September 18, 2016
Get the Koimug. Koi is an online preditor will tend to groom groups of people (ofter males) seducing them into nefarious activities
by HolyGuacamoleSauceOnABuiscute May 11, 2020
Get the Koimug. A tampon left floating like a dead fish in the toilet, usually left by dirty tramps with no bathroom wastebasket.
by michael lowe May 25, 2007
Get the albino koimug. by lighteninkmkqeen November 1, 2018
Get the Koi-Pondedmug. by Bubbers69 October 30, 2009
Get the Koi Pondedmug. 
