Definition

An emoticon depicting angry shock or outraged disbelief, typically deployed when you've been denied something you desperately wanted or witnessed an injustice. The greater-than sign adds an angry eyebrow to the classic open-mouth shock face, creating the digital equivalent of a toddler's tantrum face. Most commonly used ironically to exaggerate minor disappointments.

Example Usage

"They're discontinuing the McRib again >:O"

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=%3E%3AO&defid=14894003)