McWildabeast Share definition Flag When you're having doggy style sex with a person, you proceed to make horse sounds with your mouth during coitus. He was hitting it from behind, and he gave her the McWildabeast!!! McWildabeast by ballapimp12 March 5, 2009 0 0 Get merch Get the McWildabeast mug. Buy Now — $32.95 See more merch