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19.
Can also be pronounced simply 'Filf' or 'Frilf' (not be be confused with Father I'd like to F**k, or Friends relative I'd like to f**k)

Definition #1
Fithly is a is a term used to describe things that considered cool by some people, usually people on the dole, or in a lower income bracket. That clearly shows they do not aren't very stylish. Some things include; cheap cars with body kits, mullets, wearing motocross jerseys in town, bad makeup and doing burnouts frequent.

Definition #2 (Often used by the lower class people described in definition #1)
Fithly means that something is good, or desirable.

Definition #3
Something that is disgusting, that you never want to come in contact with.

Using the example of two friends, Bob and Cam.
Definition #1
Bob: Look at that car coming down the street.
Cam: That car is so filthy
Bob: Ha ha, sure it.

Definition #2
Bob: Travis Pastrana's double backflip is awesome!
Cam: His Motorbike is so Filthy!

Definition #3
Bob: I just watched 2 Girls 1 Cup
Cam: How can you watch that, it is so filthy
Bob: Yeah, I get nightmares about it
by MrSafety April 05, 2010
 
1.
A word originating in Seattle meaning dope, tight or cool
Damn fool, those shoes are filthy

You seen the new jersey design, shit's filthy
by Eveezy September 30, 2005
 
2.
Seattle area slang. Filthy means hot, really cool, or tight. You heard.
Look at that Porsche.
That shit's filthy.
by anonym0us February 08, 2007
 
3.
Sexual; dirty minded, nasty thoughts
"I was just thinking that you can come over and bang one another."

"Yea alright sounds filthy, I'm down."
by Antonio April 14, 2004
 
4.
Seattle area slang. Filthy means hot, really cool, or tight. You heard.
Look at that Porsche.
That shit's filthy.
by im anonym0us February 03, 2007
 
5.
an adjective used to describe dirty sounding dubstep tracks
The song "hey sexy lady" by skrillex is fucking filthy
by chillin hard December 22, 2010
 
6.
A group of girls that one would generally agree are filthy or dirty in a sexual sense. May not be a negative even though the word implies a negative connotation. Could be a sarcastic way to say that a girl is hot and (you hope) dirty.
yo, did you see those filthies in the BMW?
by JimmyMalaga July 06, 2006
 
7.
A word that means cool,fly,phat,or dope.
Usually used when you see something really really cool.
DAMN !!!
Remix'd Evolushun is SOO Filthy !!
by JB? April 04, 2008