From its earliest appearance in print in the late 19th century as a dialectal and probably uneducated form, the past and past participle snuck has risen to the status of standard and to approximate equality with sneaked. It is most common in the United States and Canada but has also been spotted in British and Australian English.
Examples of SNEAK
They tried to sneak into the movie without paying.
She sneaked some cigars through customs.
He snuck a few cookies out of the jar while his mother wasn't looking.
They caught him trying to sneak food into the theater.
Can I sneak a peek at your quiz answers?
Origin of SNEAK
akin to Old English snīcan to sneak along, Old Norse snīkja