noun

guy

An informal word for a man or person.

The guy next door always waves when I walk past.

Etymology

The word developed from Guy Fawkes and the effigies bearing his name. From a strangely dressed figure, guy broadened into an informal term for a man or person.

More examples

He's a good guy who always keeps his promises.
I ask the guy at the counter for directions.
Do you guys want to join us for lunch?

Forms

guy · guys

Similar words

man: Specifically an adult male; less casual than guy.
person: Gender-neutral in singular use and suitable for formal contexts.