var msg = "";
var rep = "lol";

function Und() {
    var messages = document.querySelectorAll(".msg-body");
    var newest = messages[messages.length-1].innerHTML;
    if(newest == msg) {
        return;
    }
    msg = newest;
    if(msg.includes("under me") | msg.includes("Under Me") | msg.includes("underme") | msg.includes("Under me") | msg.includes("Underme")) {
    document.querySelector(".chat-input").value = rep;
    document.querySelector(".chatInputSend").click();
    }

}

setInterval(Und, 100);