- fancy man
- someone with whom a woman has a regular sexual relationshipUsually the woman is married and the parties are not cohabiting:I can only remember two of them that had regular fancy-men. (F. Richards, 1936, writing of soldiers' wives)A fancy woman, bit, or piece is a mistress:They supposed that Donald must be keeping 'a fancy woman' in New York. (Boyle, 1979 — in fact Maclean was keeping rendezvous with his Russian spymaster)
How not to say what you mean: A dictionary of euphemisms. R. W. Holder. 2014.