man who marries a wealthy or upwardly mobile woman; male gold digger
Colloquial abbreviation of 逆玉の輿 (gyaku-tama no koshi), the male counterpart of 玉の輿 (tama no koshi, a woman marrying into wealth). Used for a man who marries a woman of higher economic or social status.
See also: 逆玉の輿
He's a male gold digger who married the company president's daughter.
Apparently some men go to group dates aiming to marry into wealth.
Abbreviation of 逆玉の輿 (gyaku-tama no koshi), itself a reversal of 玉の輿 (tama no koshi, 'palanquin of jewels'), an idiom for a woman marrying into wealth.