This is the 7402nd most frequent Spanish word.
hombre
Man.
Here, 'hombre' is used to refer to an adult male in general as 'man'.
El hombre camina por el parque.
The man walks through the park.
In this sentence, 'hombre' is used as an interjection to express surprise or joy, similar to 'man' in English colloquial expressions.
¡Hombre, qué alegría verte!
Man, what a joy to see you!
The word 'hombre' is employed metaphorically here to depict qualities like courage attributed to an admiring figure of a 'man'.