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Alpha Phi Omega: National Co-ed service fraternity. Largest largest collegiate fraternity in the US. Founded on the 3 cardinal principals of Leadership, Friendship, and Service. Unlike many other fraternities, APO's primary focus is to provide volunteer service within four areas: service to the community, service to the campus, service to the fraternity, and service to the nation as participating citizens.
I joined APO when I found out it was the largest dating service in the US.
by Lou_ag November 22, 2009
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Bengali word for sister. Except you don't use it unless you love your sister too much. Just like Jaime Lannister loves his sister Cersei Lannister in Game of Thrones. You could use this in a sentence like "Thanks apo apnio" which conveys the utmost form of gratitude towards the apo you are addressing.
Girl: Wow! You make killer memes!
Boy: Thanks apo apnio.
Girl: Don't come near me or my city ever again.
by A_Random_Dude September 16, 2018
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Authorized Personnel Only
Hey , APO beyond that door!
by Mike February 15, 2004
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Amusement Purposes Only - When you are married or have a girlfriend, but you have a little side piece of ass "For Amusement Purposes Only'
She aint girlfriend material - good for APO and that's about it.
by zajebisty1 March 06, 2004
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Anti-Pants Organization
"Dude, where are your pants?"
"Man, I'm in APO. We don't wear pants."
"Um... I don't think that's what that means..."
"Dude, I was just at the APO house and none of those bitches had pants on."
by TurkeyBaster February 29, 2012
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Asian Pride Only
When an asian will only talk to another asians.
White guy's friend "Check out that girl. You should ask her out."

White guy "No way man, its not worth it. She is APO."
by Steven February 23, 2005
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