Casual greeting between strangers

When you think up something brilliantly righteous while baked.

the only way to properly greet someone

When you and someone else are in an argument, and the other person says they are better than you (scored more goals in a game, got a better grade, etc.) and you tell them you got the better grade or what not, adding on the end, "sup dude?" in a nonchalant manner, just to rub it in.

a name given to a person of whom knows you but you can't recall his name to save your life. portmanteau of What's Up + Dude.

dude, sup?

A phrase extremely overused by people who are getting shittttyy! Often used as a retorical question agreeing to another persons comment instead of actually asking someone whats up.