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A New Zealand MP was caught swearing in parliament after the sign language interpreter picked up his extremely rude word and signed it for deaf viewers.

Ron Mark, an MP for the New Zealand First party, became irritated with muttering from across the chamber, during a pre-budget question time debate.

It had already been a tense session, with another MP, Labour's Grant Robertson, being kicked out of the chamber following a frustrated outburst.

He'd been asking the Finance Minister questions about what would be in the budget - to be published a day later - and had been told he'd have to wait until the morning.

Later in the debate, Ron Mark was interrupted by jeering from the Government benches, and muttered "shut the f**k up" under his breath.

Nobody in the chamber noticed his slip - but unfortunately for him, an interpreter had been invited to parliament as part of sign language awareness week. The interpreter did hear his outburst and signed it for all to see.

He later apologised for his unparliamentary language.

Mr Mark told Stuff.co.nz: ""You know, the first thing was I realised I shouldn't have said what I said and so I withdrew and apologised, but I guess it was just born out of total frustration."