grunt Идиома

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What can you expect from a hog but a grunt?

(USA) This means that you can't expect people to behave in a way that is not in their character- a 'hog' is a 'pig', so an unrefined person can't be expected to behave in a refined way.

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cluck and grunt|cluck|grunt

n., slang, avoid it in restaurants The familiar restaurant dish of ham and eggs; since ham is made of pork (and pigs grunt) and eggs come from hens (which cluck.) "I am sorry I can't fix you an elaborate meal, but I can give you a quick cluck and grunt."