(1) the expression used when addressing either someone you know well or your significant other. (2) sometimes used as a word to start stories with inflection. (3) a way to express anger at someone you don't know.
(1) dude! how's it going? (or) i really like you, dude!
(2) dude, so there was this guy...
(3) DUDE! GIVE ME BACK MY PURSE!
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.