or co·pa·set·ic, co·pe·set·ic
- fine; completely satisfactory; OK.
Origin of copacetic
1915–20, Americanism; of obscure origin; popular attributions of the word to Louisiana French, Italian, Hebrew, etc., lack supporting evidence
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copasetic, copesetic or copesettic
- US and Canadian slang very good; excellent; completely satisfactory
C20: of unknown origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for copacetic
1919, but it may have origins in 19c. U.S. Southern black speech. Origin unknown, suspects include Latin, Yiddish (e.g. Hebrew kol b'seder), Italian, Louisiana French (coupe-sétique), and Native American. None is considered convincing by linguists.
Online Etymology Dictionary, © 2010 Douglas Harper