interjection. A Yiddish ouch. Oy aaaaaiiiieeeeeeeeeeeee!
Real citation: "Ouch schmouch....check yours...I'll bet ya' it's the same!!!"
(Oct. 19, 2008, Totoya FJ Cruiser Forum, http://www.fjcruiserforums.com/forums/1165100-post109.html)
Made-up citation: "That's just a little schmouch--no need to worry. Nurse, hand me the drill with lox..."