"Would puddy tat wike a bowl of milk?" = Would pussy cat like a bowl of milk? A cartoon character, a little bird called Tweety Pie, always talks like this. There's always a cat trying to eat him. I tawt I taw a puddy tat = I thought I saw a pussy cat. This sentence is known by everybody in England. Garfield is using it to take the piss.

'I don't understand this at all.'