The sentence in the first panel means "Give, I'll grind (the grain), you rest". It is the earliest recorded example of the Polish language, written in a monastic history book in the late thirteenth century. (Details here.) It is a phrase known to almost all Poles.
The joke is that the man, whose short hair identifies him as a lower-class, uneducated person, not only can't understand his own culture, but expresses his incomprehension in crude foreign slang. Cultural colonization by the Anglosphere continues apace.