What does 甘蝦 mean when used as an answer to 保重? (Taiwan)
It is a similar pronunciation of Hokkien 感謝/感谢, so the meaning is to thank.

The 臺灣閩南語常用詞辭典 shows that the pronunciation is kám-siā.



It is a style of humor, not a joke.
We use them a lot.

Another example is 蝦米/虾米.
It is the similar pronunciation of Hokkien 什麼/什么 (what).
This one has been spread to China already.