A phenomena where a person takes a shit, freezes it to insert it into another's bung hole. The second then defecates the same shit, and the turd is said to be twice baked.
Tiffany, once a heavy meth user, lost a large share of her mental capacity for self control, reason, empathy, and logic. Substituting the chemical high of meth in lieu of extreme religious views and being "high on God", her brain is now Twice Baked.