キープ君くん

noun

backup boyfriend; man kept as a backup marriage partner

Colloquial term for a man a woman keeps as a romantic backup, often while pursuing other relationships. The 君 suffix adds a casual, slightly dismissive tone.

See also: キープ

• 彼かの女じょは本ほん命めいがいるけど、キープ君くんも何なん人にんかいるらしい。

  She has a main boyfriend, but apparently she also has a few backup boyfriends.