bunk (up) with (someone)
To share a room, bed, or other sleeping space with another person. You will need to bunk up with your sister because we weren't able to reserve enough hotel rooms for everyone. They became my best friends after I bunked with them at camp.
bunk (up) with someone
to share a bed, a bedroom, or a tent with someone. Are you going to bunk up with Fred? I'll bunk with Todd.