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.
(..) What? Come on, I left you, like, messages. When I went to your office, you snuck out the back. I didn't sneak. I was going to lunch. Skyler, what are you, the paranoid police? You know what, Marie? Marie, I have never been so humiliated in my life. That... (..)2008 TvShow: Breaking Bad Title: A No-Rough-Stuff-Type Deal Season: 1 Episode 7