a racial slur used to describe white/caucasian people. Usually used by asian and cantonese Chinese people. The literal meaning of ''Guailo'' means ''white demon''. Usually this name is used towards people named Matt, Trevor, Nathan and Will because people who hold these names are very Guailo. Other ways you can spell ''guailo'' is guilo and guailou.
Look at all the ''Guailo'' in this restaurant. ''Guailo'' can't eat chinese food.
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