Being so drunk that you even do things that would wouldn't normally do. Nearly paralytic drunk.
Girl 1: 'Good night last night?'
Girl 2: 'Babe I was out if my box, I don't remember a thing!'
Boy 1: 'I'm getting out of my box tonight, you on it?'
Boy 2: 'Yeah man!'
1. When talking in a messenger pm box with someone annoying, on a chat client such as YIM, AIM or MSN, it's used to say "Stop Pming me" or "Fuck off" to the person you're talking to.
"Get out my box! before I put ur ass on iggy!"