A MyThai is a hot sexy girlfriend that one picks up while holidaying in Thailand and brings them back to their homeland...not to be confused with the mai-tai drink served at tacky, polynesian themed restaurants.

A MyThai is usually 20-30yrs old, and the ugly man they are with is usually from England, Australia, or Germany.
Guy 1: "Wow, last week you were single, and now you are married?"
Guy 2: Yes, I went to Bangkok and got a MyThai.
by SydneyAus June 8, 2007
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