Lit. “to drink the beer one has brewed”. This metaphor is used in several variants, but ultimately means the same: you need to face the consequences of your (often unwise) decisions or deeds. Funnily, it is sometimes directed at kids to teach them a sense of responsibility, even though you only can legally buy a beer in Poland once you turn eighteen. The meaning is somewhat similar to “to eat humble pie” but stresses consequences more – and humiliation less.