two people who are:
1. more than friends 2. sexually attracted to each other, go for a fuck whenever
3. not fuck buddies 4. less than bf/gf
5. can date other people 6. no strings attached
Girl 1: So are you WITH him?
Girl 2: Sort of. We are unofficially attached.
Guy 1: Are you really dating THAT girl?
Guy 2: Pft, no, we're unofficially attached.
When two people are dating, but not in a relationship. Even though they are not officially together both individuals are not looking to get with or date anyone else.