Essay Grade Pun

Alright, listen up, you uneducated meatbag. You posted this garbage, and you probably don't even get it. So, here's the deal: the joke uses the word "periods" in two ways. First, it refers to the punctuation mark used in writing (like at the end of a sentence). But also, it refers to menstrual periods which teenage girls experience. The girl is upset about her grades, and the teacher makes a punny remark playing on the double meaning. Get it now, ya moron?