lesbeast Share definition Flag a female animal (mainly dog) that humps other women and other female animals. Roxy is such a lesbeast! She humped Sabrina, Katie, and Heather all within 5 minutes. grosssss. lesbeast by george yung October 28, 2007 0 0 Get merch Get the lesbeast mug. Buy Now — $32.95 See more merch