Yeung Sui in Chinglish means ugly. Chinglish is a popular internet language for people who speak Cantonese because they are too lazy to type chinese. So Yeung Sui Chicken simply means Ugly Chicken basically. Stupid term yeah? I know.
Not applicable when you're speaking to non Cantonese speaking people.
God look at you! You're such a Yeung Sui Chicken
by Chinglish Expert April 29, 2011
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