tr00 

Although at face value could be conceived to be a leet version of the word "true" (which it is in one sense), it is actually more commonly used amongst fans of black metal, particularly of Scandinavian origin, to compliment a band, person, or thing for it's black metal or Nordic/Viking values.
It's origins are not certain, although one theory suggests it comes from an old polytheistic religion of Northern Europe called Ásatrú. In early days, old Norse languages had no word for "faith" or "belief". Instead they used the word "tru" or "tro" meaning "truth" or "loyal to".
So using the word "tr00" in black metal terms in this case would mean black metal that is honest, genuine loyal to black metal ideas and customs.
The word does not necessarily have to be applied to bands or people, in some cases, with the more cultured and perhaps slightly more tongue-in-cheek, might describe a place as tr00 for its Nordic, satanic, spooky or dark vibes.
The term kvlt may also be used and has a similar effect.

"Mayhem are tr00 and kvlt"

"This forest is tr00"

tr00 by TimFS October 24, 2004

tr00 

ADJ: see true. can be used to agree with any statement, or to express a common interest.

Dawg 1: This iced bling is fresh
Dawg 2: tr00

tr00 by growl007 April 28, 2006

Tr00 Kvlt Metal 

Tr00 as in for real, blacker than black, eviler than evil,
Kvlt as above,
Metal, heavy metal music, chiefly Black Metal.

To sum it up, Black Metal that is not phony.

Emo Dork: "Wow, I love Immortal. That's some Tr00 Kvlt Metal right there."
Black Metal Dude: Go away, poser, and let me listen to some Gorgoroth"

Tr00 Kvlt Metal by mellowcheddar February 19, 2009

4 tr00

For True
internet slangg

Jack: Man that Gibson plays nice
Jill: 4 tr00

4 tr00 by IANN January 28, 2006

tr00f 

An acknowlegement in positive accordance with the statement.

"Yo, that bitch is so fine"
"tr00f"

tr00f by RMAR February 28, 2007

tr00f 

Conformity to fact or actuality, a statement proven to be or accepted as true.

Person 1: That movie was excellent.
Person 2: tr00f!

tr00f by Macbeth April 28, 2006

tr00f 

Truth with Proof= tr00f

Student 1: "Penelope Cruz and Salma Hayek are the exact same person"

Student 2: "tr00f!"

tr00f by Santa Real February 4, 2009