If you're confounded by internet-speak the latest jargon being bandied about online could have zipped right over your head.

New Zealand MP Chlöe Swarbrick shut down a heckler in parliament by swatting them away with the phrase 'ok boomer' during a speech.

The clip of the 25-year-old Green Party member went viral after an older politician interrupted her oration on climate change.

What does 'Ok boomer' mean?

A phrase intended to dismiss baby boomers, born between 1946 and 1964, 'boomer' is a shorthand insult used to mean someone older who is closed-minded and resistant to change.

The phrase has gained traction on social media and has spawned enterprising American teens to design merchandise sporting the slogan and pocket thousands of dollars to boot.

Only to be deployed by a young person, usually a millennial(born between 1981 and 1996), a demographic not unfamiliar with insults based entirely on their age.

Millennials have been accused of ruining everything from avocados with their stream of Instagram-worthy shots of the fruit on toast to marriage, as well as being termed 'snowflakes' - someone who is easily upset or offended and workshy.

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Why did Chlöe Swarbrick use the phrase?

Ms Swarbrick was making a speech on New Zealand's Zero Carbon Bill, which aims to meet net zero by 2050, when an older opposition member of parliament interrupted her.

She was speaking on how climate breakdown will be affecting her generation and those younger than her.

She said: "How many world leaders, for how many decades have seen and known what is coming but have decided that it is more politically expedient to keep it behind closed doors. My generation and the generations after me do not have that luxury.

"In the year 2050, I will be 56 years old. Yet, right now, the average age of this 52nd Parliament is 49 years old."

Who interrupted her?

The older male politician who was heckling Ms Swarbrick is thought to be Todd Muller, an avowed opposer of the Zero Carbon Bill.

After the remark, he postulated on Twitter whether she would still be a "millennial force for change" by the time 2050 arrived.

He added: "I of course will be very focused on the next cup of tea".

Ms Swarbrick, who was hailed a "queen" by some supporters, responded on Facebook, writing: "Today I have learnt that responding succinctly and in perfect jest to somebody heckling you about *your age* as you speak about the impact of climate change on *your generation* with the literal title of their generation makes some people very mad," she wrote.

"So I guess millennials ruined humour. That, or we just need to pull ourselves up by our bootstraps and abstain from avocados."

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What was the reaction online?

Ms Swarbrick was accused of ageism, with one person equating 'boomer' with the use of the n-word.

The Twitter user swiftly deleted their tweet.

Former Scottish Labour leader Kezia Dugdale tweeted on Friday that she had been 'ok boomered', much to the mirth of many of her followers.