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1.
Hollywood Undead is a band whose music has been described as a mixture of hip hop, emo and metal. The band originated in 2005.

HU4L = Hollywood Undead 4(for) Life.
Man, i'm going to see HU tonight down at the dome.

Dude, HU4L!
by AmorshC August 29, 2008
 
2.
cyber/text language for 'hate you for life'
person 1: "sori man i jst dnted ur car :( "

person 2: "omg r u bein serious?! HU4L!!"
by LetItRoam June 07, 2010