1.
You Already Know
2. Yes, Definitely, Maybe, Quite Possibly, Probably, Most Likely, It was Alright
3. An affirmative response that's definition varies depending on the tone used while speaking the word
4.. The word can be used to agree, as a greeting, an answer, a definition of a feeling
It depends on your tone completely, on campus we all say it regardless of the subject because we can relate it to many things and
you know what people are talking about because as
the definition says: you already know