Perhaps it's a secret code word that Gollum has cunningly crafted in his training sessions. Roughly translated, it might mean "kick him into row Z" or "break his neck", or some such instruction consistent with his time at Scouse 1 and whenever they used to play City.
On the other hand, it could be a derogatory term in the vein of "you pettyfogging dullard", once again perceptively created by the master tactician from Caledonian climes.
However, it might be more complex than that as it could be a pigeon form of Esperanto, mutated by a Glaswegian Gorbals (or should that be Goebbels ??) influence.
Who knows what goes on in the mind of a man who has a head full of sawdust ??