This is the 2487th most frequent Swedish word.
kille
"Boy" or "guy."
Here, 'kille' is used to refer to a young man or boy in an informal and friendly manner.
Han är en rolig kille.
He is a funny guy.
In this sentence, 'kille' is used to casually identify an individual who's male.
Det sitter en kille på bänken.
There is a guy sitting on the bench.
This usage of 'kille' indicates the gender of the cousin and is standard in conversational contexts.