The ultimate trifecta and sole purpose in the human life. The goal which only brightest and bravest human souls hope to achieve. Of course... yes... this is in reference to the simultaneous sneeze, fart and burp. Side effects include breathlessness and awe.
A combination of the words shit and narsty, a modified version of the word nasty, which combined yield an adjective describing something that is utterly and horribly nasty.
John: "That woman is utterly disgusting. I wouldn't even look at her if we were the last two people on the planet."
Ben: "I know, man. She's shnarsty!"