Let me first correct some spelling and grammar mistakes in your question. Two men WERE quarraling. One man said, "I'm offering you a world class coach. You SHOULD be kissing my feet." (Why does he use "SHOULD be" instead of "SHOULD do"? DOES he want TO emphasize something?) Then another man RESPONDS WITH this sentence, "It will be a cold day before I kiss anything of yours." 1) The first man could also say, "You should kiss my feet", it would be grammatically correct, of course. However, by saying "you should be kissing my feet", using the present continuing tense, he is emphasizing the action and also makes more of a contrast between what he should be doing (kissing his feet) and what he is actually doing. 2) The full idiom is "It will be a cold day in Hell before I..." Hell is supposed to be extremely hot, so the meaning is that whatever comes after "before I..." will never happen. Hope that helps!