Dexter - What's up people? (Maximum the Hormone)
Dexter - father, husband, brother, friend, bloodstain pattern analyst in Miami Metro Police Department and... a serial killer.
Song came from anime "Death Note". I don't speak Japanese but both "Dexter" and "Death Note" are about men who decided to administer justice on their own. So I guess lyrics should match.
I'm also a little influenced by this translation: