proboscis monkey Share definition Flag A fugly monkey with a huge ass nose and is usually obese. It makes a screwed up honking sound. See fugly. teh proboscis monkey go teh HONKHONKHONK0rz!11!!11 LOLOLOL!!!! proboscis monkey by GreyJinjo December 19, 2003 0 0 Get merch Get the proboscis monkey mug. Buy Now — $32.95 See more merch