[Babu]

The first two dictionaries I looked at said 'snuck' was OK.

"snuck" is correct grammar:
["done snuck up on youse" is not :) ]

4 results for: snuck
sneak /snik/ Pronunciation Key - Show Spelled Pronunciation[sneek] Pronunciation Key - Show IPA Pronunciation verb, sneaked or snuck, sneak¡Eing, noun
¡Vverb (used without object)
1. to go in a stealthy or furtive manner; slink; skulk.
2. to act in a furtive or underhand way.
3. British Informal. to tattle; inform.

[Right Wing Assault]

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