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1.
Bad luck or misfortune. Especially in a kharmic sense.
You'll have such schmertz tomorrow for pushing me down those stairs!
by HJR April 19, 2006
 
2.
To defecate, esp. with a strong offensive odor.
Oy vey! Who schmertzed in the schvitz?!
by Kip Kipling February 26, 2011