This is the 7826th most frequent Polish word.
meksykanów
"Meksykanów" is the genitive plural form of "Meksykanin," meaning "of Mexicans" in English.
Here, 'Meksykanów' is in the genitive plural case, referring to a group of people of Mexican origin.
Widziałem grupę Meksykanów w parku.
I saw a group of Mexicans in the park.
In this sentence, 'Meksykanów' again uses the genitive plural case, signifying possession or relation (the Mexican culture).
Rozmawialiśmy o kulturze Meksykanów.
We talked about the culture of Mexicans.
Here, 'Meksykanów' is used in the accusative plural case as the object of the sentence, indicating whom the speaker does not know.