gaijin hunter; person attracted to foreigners
Colloquial and often derogatory term for a Japanese person who actively seeks romantic or sexual relationships with non-Japanese people, especially Westerners.
That girl is a gaijin hunter; she always has a foreign boyfriend.
外人ハンターと呼ばれるのを嫌がる人も多い。
Many people dislike being called a gaijin hunter.
Compound of 外人 (gaijin, 'foreigner') and ハンター (hantā, from English 'hunter'). The term emerged in colloquial Japanese to describe a person who actively pursues relationships with foreigners.