The most annoying thing you can ever call one of your video game characters, often used in World of Warcraft by tools.

The term retards use to describe that they have an alt or a character on a mmorpg. You know how STUPID TOON sounds? Jesus...

Toon, usually referred as a character in an online role playing game. Also known as an alt, or character.

Or, something an idiot would say

The word, which if uttered, will cause a cruise ship to pass by.

the word "town" spoken in a geordie accent sounds like the slang term "toon." newcastle's football (soccer) fans are known as the "toon army" - this led to a sky sports presenter being fired recently for using a shockingly poor taste pun on "tsunami" which i'll not repeat here.

Newcastle upon Tyne, UK

a short form for cartoon.
It became a popular way to refer to a cartoon character in the 1981 Gary K. Wolf novel Who Censored Roger Rabbit?