What is Manz?
1.
Just a word that boys that think their hard use instead of refering to themselves as "I"
"Manz got arrested!"
See
2.
Man. Particularly used for those with whom you are familiar. Associates, friends, etc. Also usable as a suffix on the end of first names and other nouns (see example)
"Whaddup my manz?" - "Dudemanz... how goes it?"
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3.
Not actually a real word. Just some idiot putting a z on the end of man to indicate more than one man, which should really be men.
"Yow Yow itz used by dem wite bois to diss us bad manz fo' sho"
Alternative: "Hey friends, those people were insulting us men"