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An "ounce" of 25 grams. Used similarly to a "baker's dozen" so the customer doesn't cause trouble for being ripped off accidentally or, more rarely, out of simple generosity. Originated in Fairfield, a city north of Cincinnati.
"You positive this is an ounce?"

"Yeah, and I made it a Cincinnati Ounce just to be sure."
by Charles Prescott September 04, 2011
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