Cincinnati Ounce
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."
"Yeah, and I made it a Cincinnati Ounce just to be sure."