The image is a tweet. The tweet's author, @maratsuu, is expressing anger and contempt towards elementary school graduates. The phrase "Haarp maarp her boku da biliyonuz amına koyduğumun ilkokul mezunları" translates roughly to "You elementary school graduates, you know everything, you goddamn idiots." The use of "Haarp" and "maarp" are likely vulgar alterations/abbreviations of Turkish words or phrases intended to intensify the insult. The core insult is targeting the perceived knowledge or intelligence, or lack thereof, of elementary school graduates. The final part, "amına koyduğumun", is a very strong and vulgar Turkish curse directed at the individuals. In short, the joke (or rather, the expression of anger) is a crude and disrespectful generalization about a group of people. There's no humor in a positive sense; it's an expression of negativity and contempt.