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nullabat
a secret language, like pig Latin, where the sound "ulla" is added into the middle of each syllable of speech: We speak in nullabat so that Mum can't understand us. Compare arpy barpy.
Contributor's comments: A variation of this in the Brisbane area is "Arpy Barpy" where "arp" is inserted in each syllable. Arpi arpam sparpeakarping Arpy Barpy.