Sometimes you might see this in your cantonese speaking friend's convos. In Chinese, Sau Pei means shut up. And if you translate Sau Pei word for word then it means Collect Skin.
Weird things that chinese people come up with lol
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.