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.
(..) Alex eat. It's showtime. Thanks for not giving up on me. Man, you almost gave me a heart attack. You can't just come sneak up on me. Just because you're a lion... Let go of me. Let go of me. We're getting out of here. Guys, just go with me on this. Like I said, it's showtime. (..)2005 Madagascar