dirty beaver Share definition Flag A 20 year old sweaty, greasy, slimy, hairy, moldy, tuna stuffed pusy. Oh, man. I was gonna trim her bushes last night, but she has a nasty ass dirty beaver. dirty beaver by Russell Barker July 1, 2006 0 0 Get merch Get the dirty beaver mug. Buy Now — $32.95 See more merch