re: Wtf is happening to my yard? Pics included

Definitely over-application of the D. Don't feel dumb, I did the exact same thing to mine in the fall, and I should know WTF I'm doing. You may can salvage the grass that is yellowing, shoot some N and water the hell out of it. It may work. If not, just hang in there, you didn't kill it all and it'll spread back out. It may take a while, and the bullshite grass is gonna grow, just pluck the crabgrass and weeds by hand until your desired grass comes back.

Next time, use 1-2 oz of the D per gallon (**ETA of water) and 1% surfactant (about 1.25 oz/gallon of water). What happened to me, I doubled the rate because I thought my grass was dormant, well I guess it hadn't cooled down enough. I waited on a rain instead of watering, it didn't rain, and I burnt up most of my yard. So pump some water and nitrogen, you may save some of it.