pak choi

it is Chinese for cabbage. very popular among old people traditionally used in stir fry. pak choi is tasty, versatile and nutritious, but it isn't as widely used as it should be. it is also referred to as bok choy
in jersey it is slang for rubbish.

北彩 or 白菜

As it is very hard to overcook Pak Choi due to it's crispy nature, we can ascertain that this saying is used to denote the action of ingesting far too many drugs or units of alcohol.