Lyric discussion by Kreamlingdude 

Cover art for Mr. Brown lyrics by Bob Marley and the Wailers

This song is about a duppy (Jamaican patois word for ghost,spirit) named mr brown. You can notice on the part where it says: O-o-oh, calling duppy conqueror, I'm the ghost-catcher! This is your chance, oh big, big Bill bull-bucka, (bull-bucka is another word for bad soul,spirit) Take your chance! Prove yourself! Oh, yeah!

it's about heroine