General allrounder. Used in coversation when one or parties concerned can't be bother to actually make conversation. Used widely on "King of the Hill" when the guys are all drinking beer and shooting the breeze.
A mildly stereotypical 'gangsta' greeting. Used more often by white boys.
Best pronounced "Boooooooooooooooom" followed by an Ali G-esque finger snap.
Can also replace the phrases "I emphatically agree" or "Thats the best news I heard for ages"