An intensive form of what.
Used to express astonishment, shock, incredulity, or disbelief (as a shortened form of expressions such as "What the fuck is going on?", "...are you doing?", "…is this?" "…is it" or "...is that?").
Used to express nonchalance or the dismissal of any consequences of something one is about to do.
Why is that not true?
Used to introduce a proposal.
Used to state that one has no objection to and approves of a proposal.