This is the 11170th most frequent Polish word.
gostek
"Gostek" is a colloquial term meaning "guy" or "fellow."
The word 'gostek' refers to a man in a casual and informal way.
Ten gostek zawsze przychodzi spóźniony.
This guy always arrives late.
Here 'gostek' signifies an unknown man encountered in a casual situation.
Spotkałem jakiegoś gostka na przystanku.
I met some guy at the bus stop.
In this sentence, 'gostek' describes a man whose actions are uncertain or informal.