When Pigs Atock

I'm listening to Eric put Everett to bed right now, and I just have to record their latest bedtime shenanigan.  For the past three nights, I hear squeals of laughter at Eric making his toy pig attack Everett accompanied by screams of "I want a pig atock!  Pig atock!"  I know, it seems nightmare-inducing to have a stuffed animal you sleep with attack you, but I assure you it's nothing but the biggest giggles.  I'm pretty sure it's a pig tickle attack.  It's giggles for me downstairs too listening to "attack" pronounced "atock".  Perhaps this is a British tradition I am unaware of.  ;)