noun

1. A man, generally a younger man.

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

2. (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.”

3. An inexperienced cowboy.

Synonyms: bloke, chap, cove, guy, dandy, fop, masher, mate

verb

1. To address someone as dude.

2. To take a vacation in a dude ranch.

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

interjection

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

   “Dude! You finally called!”