Snuck

verb

1. To creep or go stealthily; to come or go while trying to avoid detection, as a person who does not wish to be seen.

   "He decided to sneak into the kitchen for a second cookie while his mom was on the phone."

2. To take something stealthily without permission.

   "I went to sneak a chocolate but my dad caught me."

3. (ditransitive) To stealthily bring someone something.

   "She asked me to sneak her a phone next month."

4. To hide, especially in a mean or cowardly manner.
5. (with on) To inform an authority of another's misdemeanours.

   "If you sneak on me I'll bash you!"