A girl that fucks around with a lot of guys in the same group. Or snapchat whore that does nothing but sends nudes to every guy that adds her.
"Why would he want Brenna she's the community couch?"
"Fuck if I know. She's easy? Hope he doesn't grab bed bugs and fleas."
A coutch or fold-out bed downstairs or in a basement that has seen a lot of fucking from its owner as well as visitors.
I would rather pass out on a community fuck couch.