Coined by the now famous comedian "Larry the Cable Guy". It has traditionally been associated with such social stratum as "redneck" or "hillbilly", but as since gained a much wider usage base. It can be, and is most often used, to answer just about any question. Replace with words and phrases such as: yes, no, sure, why not, sorry, wednesday does not work for me, I said no mayo but thats fine......and so on.

It can be also used as an expression of joy or approval.