What would you say is the most colloquial term, phrase, or word we use often?

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The word I'm thinking of is: "Cool!" It's been used to describe many things, being either that of a noun or a verb, for the longest time I can remember. How about you? Now I know there are many other words out there that we've all used over the years, to describe certain things or the way we feel about certain things or situations. But how many other colloquial terms, phrases, or words can you think of, that you/we have incorporated into our everyday vocabulary? Know what I mean..."man"? cdrxo