1) Can be used like 'omg', 'ouch!', 'yeah right' or 'kmt' (kiss my teeth)
1) Refers to any person like 'mate', 'dude' or 'friend' etc.
So Cha' dread can be an equivalent to 'omg dude'
Girl1: Did you remember to bring your phone?
Boy1: Cha' dread! No, I forgot.
Boy1: Hey dread, how was the party?
Boy2: Cha' man it was real good!