Meaning

verb to go stealthily or furtively

verb put, bring, or take in a secretive or furtive manner

verb make off with belongings of others

originThe irregular form snuck originated by analogy with struck for the past of strike, stuck for the past of stick, etc. Snuck was originally limited to a few dialects, but is now very widespread (especially in American English) and is recognized by most dictionaries. The word is now one of the best examples of irregularization of a regular verb, along with dove.

Etymology from Wiktionary, CC BY-SA 3.0