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Definition: A romanised code-mixing phrase that westernised Hong Kongers use to refer to an easy task, which is equivalent to 'piece of cake' in English.
Usage: E.g. A: Thanks for helping me out! B: No problem! Sup sup sui la!
Synonym: 濕濕碎
Reference: https://www.localiiz.com/post/culture-local-stories-guide-hong-kong-descriptive-slang-phrases