When you and a few friends "get together" and generally reside on the couch the whole time. watching tv, eating delicious yet sinful snacks, bs-ing, and cuddling are a few of the activities that take place at a couchtogether
Dick: so whats goin on tonight?
Jane: im thinkin about hittin up a few ppl and havin a couchtogether, wanna come?
Dick: yeah sounds like a plan, i feel like just chillin anyway