ONO
ONO definition by Slang.net - The Slang Dictionary
This page explains what the acronym "ONO" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Online sellers use ONO to mean "or nearest offer." If a listing includes this acronym, it means the seller is willing to accept an offer less than their asking price. The seller will sell the item to the buyer whose offer is closest to the asking price.
More commonly, you'll see sellers use the OBO acronym when they're willing to entertain offers below their asking price. You may also see sellers use the ONCO acronym, when they will accept only cash offers.