Semtize Share definition Flag Someone who rides an incomprehensible amount of cock in order to succeed at life. He/She is usually jailbait and lacking in real friends. Dude that guy sucked almost as much dick as a Semtize. Semtize by Semtize August 22, 2012 0 0 Get merch Get the Semtize mug. Buy Now — $32.95 See more merch