a moron or otherwise silly person. One who spends their time pissing about and not actually doing any work. Affectionate. can also be called, mumzy, mumpy or mumzybob
"Holy Crap, your such a mumtaz today!"
"OI MUMTAZ DO SOME BLOODY WORK"
"what you feel like doing today?"
"just lying about like a mumtaz"
In Arabic Culture it means to be #1, or the best
this race was mumtaz, one of the best I've seen