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The sledge of the year is uttered after 1 minute 45 seconds as Social Development Minister Paula Bennett and Labour's Jacinda Ardern spar during question time.
Speaker Lockwood Smith said the insult was "less than ideal [but] nobody can say that's outrageously offensive" as Labour's Trevor Mallard alleged.
Ms Ardern got her own back on Twitter, tweeting "Kids in the gallery could be forgiven for thinking they were watching a Hairspray revival."