Is it possible to use c'mon guy instead of c'mon man?
closed as not a real question by jwpat7, MrHen, cornbread ninja 麵包忍者, Daniel δ, MετάEd Mar 26 '12 at 3:47
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You can't just substitute guy for man in such idiomatic expressions. For example, we don't use "Hey, guy!" as a greeting - it's "Hey, man!". And an "all right guy" is someone we approve of - if we're enthusiastically agreeing with someone we say "All right, man!".
Some people might think "Hey, c'mon guy!" is a bit more distant/hostile than the far more common "Hey, c'mon, man!", but I certainly wouldn't use guy there myself. If I was trying to talk down to the guy, I wouldn't want him thinking I didn't have a proper grasp of idiomatic language.
You can say "c'mon guy" but depending on the region "guy" might be seen as somewhat derogatory. It could be a response to someone who you hold little respect for, where "c'mon man" would be something you say to a friend.