Senses
卖炭的掉在面缸里/ 賣炭的掉在麵缸裡 cannot tell black from white
(xiehouyu) To be unable to distinguish between right and wrong or good and evil. Literally "a charcoal seller falling into a flour vat", where the black of the charcoal and the white of the flour are mixed up.
References
No references for this word.