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1.
Sexpat (noun), an compound of sex and expat or expatriate.

A sexpat is one who participates in tourism with the express intention of having sex.

There may be a variety of reasons for this, such as:
less restrictive laws in foreign countries;
anonymity or privacy;
a preference for people of other ethnic groups;
financial reasons i.e. if one travels from a wealthy country to a poorer one.

However, by far and away the single greatest reason for the existence of the sexpat phenomenon is that sexpats find securing carnal relations with someone in their own country difficult to impossible to achieve.
Andy: I'm becoming fed up of Phuket.
Shane: Why?
Andy: It's because of all the nasty old ***man sexpats over here.
Shane: I agree. Shall we go to Patong and ogle some bar girls?
Andy: Ok.
by Roo May 30, 2005
 
2.
A person (generally man) who "couldn't get laid in a brothel back home", who moves to a poor country where prosititues are cheap to "finally be treated like the man he always knew he was."

The difference between a sex-tourist and a sexpat is the sexpat must LIVE in the country, a sex-tourist is a short stay visitor.
A sexpat approached me in Starbucks whining "all the Thai girls are just after my money."

"Ohhh reeeally" I mocked Mr Ugly Sexpat, did you think it was your fat gut or your balding head the pretty girls were after?
by Karen Fleming December 26, 2005