1 definition by The Most Hated

Top Definition
AO
AO = All Out. Its the hip new slang way of saying All Out. It was made popular when Ethan of HG added it to his vocabulary. And now all the cool kids at school are saying it.
"Dude, that move was f*cking AO!!! You shot them all in their faces."
by The Most Hated January 20, 2005

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