A genre of music that has become popular to scene kids simply because of the name and the way it is spelled. Embodies hard core, pig squealing vocals (br00t4l), and heavy metal riffs accompanied by a plethora of differents screams. Also, teens may call themselves m3t4l because of the music they listen to or the way that they act, usually accompanied by a "m3t4l" claw in a myspace picture.
d00d that girl is so m3t4l, look at her music preferences!
Yeah man, Job for a Cowboy, Bring me the Horizon, See you Next Tuesday, she's br00t4l!