YotKon 

A person who has zero or minimal friends. One who isn't usually accepted by the majority of society. A person who has a lower intellect than the "normal" people. YotKon's usually spend most of their lives doing or partaking in one activity.(computers, etc.) A YotKon usually is fairly unattractive and sees this certain activity as a refuge from the "normal" world.
Characteristics: May be pale, unattractive, a bore/freak to "cool/popular" people, girlfriend-less, etc..

That guy is a true YotKon.

YotKon by Heero March 3, 2004

yotoon 

Disappearing for lengthy amounts of time. Someone who used to be around constantly, and has suddenly disappeared without warning or notification.

Has Steven pulled a yotoon on us?

yotoon by segastep January 22, 2014

Yokonomatopoeia 

When you sound like Yoko Ono but are, in fact, not Yoko Ono

John Lennon: A dream you dream alone is only a dream. A dream you dream together is reality.

Yoko Ono: I said that before!

John Lennon: AAAAARGH, I suffer from Yokonomatopoeia.

Yoko Ono: Well, I don´t

Yokonomatopoeia by T. Carlton October 31, 2012

Yokonophobia 

The fear of loud, shrieking noises.

After running away from the Plastic Ono concert, my psychiatrist diagnosed me with having yokonophobia.

Yokonophobia by Toro Jefe January 17, 2022