When man, typically you (the person reading) is about to eat, or is eating. Could also be used to say someone else is eating or is hungry.
EX1;
Dedoid: "Oi Connor, Felix looks hungry, don' he?"
Connor: "Yeah, man's on the munch."
EX2;
Dedoid: "Oi Connor, come play xbox with the lads."
Connor: "Man's on the munch."
Dedoid: "Oi Connor, Felix looks hungry, don' he?"
Connor: "Yeah, man's on the munch."
EX2;
Dedoid: "Oi Connor, come play xbox with the lads."
Connor: "Man's on the munch."
by PlazmaWolffe November 15, 2016