Urban Dictionary

I find it extremely annoying when someone uses an acronym, slang expression, or phrase and I have no idea what they're talking about. Fortunately, there's a solution to this minor problem: Urban Dictionary.

Full of R and X-rated content, this user-generated dictionary has definitions of every possible slang word. Since anyone can submit, some of the words and definitions are ridiculous. Each entry has a thumbs up and thumbs down count next to the definition to give the user an idea of how popular the word and its definition are.
The site offers a Word of The Day, which you can sign up to receive by email or by RSS feed. These words are usually pretty funny and actually useful. Here are a few current examples.

December 12
w00t
An expression of joy and excitement.
I just got an A on my test. w00t!

December 11
wi-five
It's a high five that doesn't involve actually contact, normally over a long distance where a real high-five isn't possible. Mix of "wireless" and "high-five", hence "wi-five", (wireless high-five)
Iain (yelling across the room): Dude, that mess was teh pwnz. Wi-five, brosef.
Eric (in response): You need to chill with that nano shit, son

December 10
compunicate
When you are in the same room with someone, each on seperate computers, and you talk via Instant Messenger instead of speaking to them out loud, in person

Even though they are sitting right next to each other, Jesse and Justin only compunicate when they have to tell each other something.

Next time you're reading something on the internet, whether a website, a blog, a forum, or whatever, and you come across an unfamiliar word or acronym, give Urban Dictionary a try.