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1.
a chinese last name. Used in Taiwan. Otherwise Cai in Mainland China
Tsai is the 24th most common Chinese family name.
by didorider December 19, 2005
 
2.
Asian terminology synonymous with the words:

1. Cool
2. Hip
3. Awesome
4. Random
Wendy is such a tsai when it comes to life.
by 131olds October 07, 2007