tshul bzhin ma yin pa'i yid la byed pa
Improper conceptual activity. (KHS)
Equivalent to wrong or perverted thoughts, such as taking something that is impure to be pure, something that does not exist as self to be an existing self, something that is impermanent to be impermanent, suffering to be happiness, and so on. (Source Buddha Nature by Khenpo Tsultrim Gyamtso Rinpoche).