A mix between crunch and chomp. There is also something called the forbidden chunch which is cannibalism... those who commit the forbidden chunch go to jail if they get caught.
I’m about to chunch on this freaking philly cheese steak dude
A Chunch is your prototypical douche, everything he does and says just is utterly idiotic and you need to treat him as an idiot.
Wow did you hear what Adam said? He's such a chunch.