I now have another language under my belt - Junior Speak. Here are some of his favourites (he does have a wider vocabulary, these are just his funniest):
Muma-mah = no
Muma-maaaaah! = no fucking way
Bada = outside
Bukka = biscuit
Babba = saba (grandad - the Israeli version)
Ido = avocado
TooToo = train
Rrawwgh! = lion
Porter = water
Wheel = whale
Up = pick me up
Uuuuup! = look, you might well pay the meshkanta (mortgage), but pull your fucking finger out and pick me up!