interbuddy 

Two people who are only friends over the internet. They may not know each other in real life, and if they do, they act like strangers when put together.

John is Tim's interbuddy.

interbuddy by Acid Monkey July 27, 2010

winterbuddy 

Person you date solely to get you through the winter (the cold, loneliness), and then dump in the spring.

Did you hear that Tessa broke up with John Tuesday? I guess she was never that into him and he was basically a winterbuddy. Just needed something there for a month or two.

winterbuddy by vermonster March 10, 2007

Interbully 

A term for someone who tries to act like a badass and talk a lot of shit over the internet. Attempting to be a bully on the internet. Generally resulting in people laughing at you and not taking you seriously. Interbullying can take place in chatrooms, via instant messengers, on forums, social networking sights or blogs. Even on Urban Dictionary! Nowhere on the interweb is safe!

"check out this douche trying to talk shit about me on facebook. he's trying to be an interbully because he knows if he ever said that kind of shit to my face i'd flatten his nose!"

Interbully by candymanmike April 1, 2010