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.
(..) Uh, which way, which way? OK, where? That way! That way! This is it, I think. Uh! Oooh! Uh! - Lemme sneak a peek. - OK. Uh! Huh. - This is it. - Oh. C'mon. (..)2006 Tenacious D in the Pick of Destiny