1 definition by TheFlowerDuet

Top Definition
Cantonese dismissive slang meaning 'crazy' or 'stupid'. Used to describe ideas, behaviour or even people.
ideas: "and after paying the initial fee, they requested a further $600 for membership .....chee sin!"

behaviour: "today he went chee sin and played on his playstation for 7 hours straight."

people: "you are chee sin" or "what's up, chee sin girl?"
by TheFlowerDuet June 30, 2006
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