Definition

The classic emoticon representing a gasping open mouth, deployed when text needs to convey shock, surprise, or excitement. A digital ancestor of today's emoji, this simple combination of colon and capital O has been expressing disbelief since the early internet era when our communication options were charmingly primitive.

Example Usage

Sarah: I just won tickets to see Taylor Swift! Emma: :O NO WAY!

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=%3AO&defid=16233448)

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