As a teenager she would 'sneak' out (of her house/apartment) at night to visit her boyfriend.
I'm going to 'sneak' a smoke. [=I'm going to smoke a cigarette while nobody is watching]
She took a 'sneak peek' [=a secret look] at the birthday presents hidden in the closet.
(..) Not that you're not pretty. I don't mean it like that. It's just, you gonna fuck a guard, fuck a fat one. That way they're more appreciative. Let you sneak in cigarettes. Maybe bring you McDonald's. Is that how you really think? That's how you need to start thinking. I'm trying to look out for you. (..)2013 TvShow: Orange Is the New Black Title: The Chickening Season: 1 Episode 5