Ugmonster Share definition Flag 1. A person who is displeasing to the eye, unnatractive, repulsive etc. etc. G: have you seen Sophie recently? L: No I try not to she is an ugmonster! Ugmonster by I get poked all the time April 2, 2008 0 0 Get merch Get the Ugmonster mug. Buy Now — $32.95 See more merch