This is the 8688th most frequent Russian word.
парень
"Парень" - "guy" or "young man."
Here 'парень' is used to refer to a male individual casually, equivalent to the English word 'guy'.
Этот парень вчера был на вечеринке.
This guy was at the party yesterday.
In this sentence, 'парень' refers specifically to someone's boyfriend, indicating a romantic relationship.
Она познакомилась с парнем из другого города.
She met a boyfriend from another city.
Here 'парень' indicates a young man, emphasizing the age and general demographic of the individual.