F/O

F/O usually stands for Fictional Other, which is a term often used by Self-shippers, mainly on Tumblr.

You can have romantic, familial and platonic F/Os!

Self Shipper 1#: Yo, I got a new F/O!!
Self-Shipper 2#: That's so cool, who are they?
Self Shipper 1#: It's Peter Parker from The Amazing Spider-Man, 2012!

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w/o

Short way of saying "with out"

I am going to the store w/o my wallet.

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O Genio

Welton.

Welton the Rocketman is, O Genio.

o face

a term used in the movie Office Space to describe the face one makes when achieving orgasm.

I'm gonna be showing her my O face.

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Double O

A term lowtiergod users literally referring to COON

We got Boosie here acting like a complete Double O

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John O

The gorgeous frontman of The Maine, a band from Arizona. His birth name is John O'Callaghan, but he is often refered to as simply John O.

Girl 1: Hey that guy is HOT! What's his name?
Girl 2: JOHN O, duh.

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Ayun o

A wise proverb, often linked with wisdom and proverbs. Pronounced ah-yoon-oh, it is often blurted out on most occasions where reality seems ineffable or difficult to describe.

Dude 1: Hey Dude 2!
Dude 2: Hey Dude 1!
Dude 1's head gets lopped off with a chopstick
Dude 2: Ayun o!