It means that he doesn't have any money. This comes from Antipodean (i.e. Australian and New Zealand) idiom, where a razoo is an imaginary coin of small value.
Common uses of the idiom are: "I'm down...
It doesn't mean anything. It is simply a mispronunciation of "Muslim". Muslim is pronounced ˈmʊslɨm/ MOOS-lim. See related link for an audio pronunciation.
He may or may not be. Certainly there are some issues here, and serious ones. But there is nothing you can conclude with any certainty from this evidence. Talk about it if you can or investigate it...