its a quote from the movie scarface which has become
poular amoung people to say when they do things like expose thier penis or pull out a gun, or a baseball bat, a chainsaw,
flip someone off, etc.
it is a way to imitate the persona of
tony montana.
you girlfriend cheated on you and she dont know you know and you pull out a small sword and say hello to
my little friend before you
plunge it into the back of her skull as you "finish up"
doggystyle.