This is the 7309th most frequent Polish word.
kampinoski
"Kampinoski" refers to something related to Kampinos, a village or the Kampinos National Park in Poland.
The word "Kampinoski" is an adjective derived from "Kampinos," referring to the Kampinos area, and it clarifies that the park belongs to or is associated with Kampinos.
Kampinoski Park Narodowy jest popularnym miejscem na wycieczki.
The Kampinos National Park is a popular place for trips.
Here, "kampinoski" describes the cheese as originating from or being associated with Kampinos, indicating a specific type or regional specialty.
Chcę kupić kampinoski ser, który byłby idealny na kanapki.
I want to buy Kampinos cheese, which would be perfect for sandwiches.
In this instance, "kampinoskim" is used in the locative case to describe the picnic as taking place in or being associated with Kampinos, emphasizing the location or origin of the event.