ベッドイン

noun, noun or participle which takes 'suru', intransitive verb

going to bed (with someone)

Wasei-eigo from 'bed in', typically implying sharing a bed with a romantic partner. Often used in a playful or euphemistic way.

wasei-eigo (Japanese-coined English), from bed in

• 彼かの女じょと初はじめてベッドインした。

  I went to bed with my girlfriend for the first time.

• 今こん夜やはベッドインするつもり？

  Are you planning to go to bed together tonight?