dude

A man, generally a younger man.

"So we were at the mall and these two dudes just walk up to us and say "hi"."

(used in the vocative) A term of address for someone, typically a man, particularly when cautioning him or offering him advice.

"Dude, I'd be careful around the principal; he's having a bad day."

An inexperienced cowboy.

To address someone as dude.

To take a vacation in a dude ranch.

Usually followed by up: to dress up, to wear smart or special clothes.

A term of address, usually for a man, conveying awe, excitement, surprise, etc.

"Dude! You finally called!"