Woot: Woot is often used in the 31337 hacker community, especially on IRC as an exclamation of happiness or joy. Much like the word hooray.

Example: "Woot", my node got cooled.

OR

Woot'n I just haxored into the Gibson at the pentagon.

Also acceptable is "Wooty Woo!". Which can be used much like "Wow" or "OMG".