mellowed

Similar to shitfaced - when you've hit your limits using a drug, such as weed or shrooms, and you become incoherent, having difficulty remembering simple things you usually would. The difference is, however, is how it's usually a mellow, calm feeling, rather than a nauseous and sickly one (very different to a Bad Trip).

Guy 1: yooooooooo dude im so fuckin mellowed rn hahaaaaaaaaa
Guy 2: Who are you? Get out of my house, you stoner fuck.