Shumiss is where you take a bath and you relax so much that you release all of your bodily fluids in a bath so it's a shit, cum and piss mix. Pronounced Shum-iss.
ahh Brad, did you see did you see Kathy's instagram picks of The Shumiss mix in her bath last night? yeh bro it was savage!
by StopWankingMeOff December 13, 2016