Photo Illustration by Thomas Levinson/The Daily Beast/FXIf there’s one turn of phrase that Bear, Elora, and the rest of the Reservation Dogs cast love the most, it’s gotta be “shitass.”For three seasons, characters young and old have spouted it back and forth, up and down the fictional streets of the fictional Oklahoma reservation town of Okern. Sometimes it’s used as an insult, sometimes as a term of endearment. More often than not, however, “shitass” is something in between—a call-out that spe