Kieran Culkin goes viral after making incredible list about British people

American actor Kieran Culkin has learned a lot about the British way of life since tying the knot with London-born wife Jazz Charton in 2013.

And interestingly, the Succession star believes he's been able to consolidate his findings in a list of 'Britishisms', which he shared with viewers of The Graham Norton Show on Friday (13 Dec).

Kieran, 42, whose resided in the States all of his life, met his other-half back in 2011 at a bar in his local Manhattan neighbourhood.

Jazz, meanwhile, had moved from the 'Big Smoke' to the 'Big Apple' a year prior, after she took a job in an ad agency's music department.

The duo tied the knot in 2013, and have since welcomed two beautiful children together - a daughter named Kinsey Sioux and a son Wilder Wolf.

Kieran and Jazz have been married since 2013 (MICHAEL TRAN/AFP via Getty Images)

Despite the Culkin family always having lived in America, they often travel to the UK to visit Jazz's family.

It is on these trips that the former Home Alone child star says he learned what it truly meant to be a Brit, and over the years, he's formed a list of the most common habits exhibited by UK-hailers.

Appearing on The Graham Norton Show last week, he was asked by the Irish presenter about his ties to the United Kingdom, where he opened up about the most 'adorable' words he's learned from his British wife - beginning, oddly, with 'baps'.

"There’s this wrestler called Biggie who was this really big muscular guy, big biceps, you know? Pecs all that," Kieran kicked off.

"He had a singlet on him and before he would do his finishing move, he would take it off, and we were watching this on TV, and she just went, 'That’s right, love, get your baps out.' I was like, 'What?! I need that word'."

Kieran spilt the tea while chatting to Graham Norton (BBC)

He went on to tell the audience: "You guys have the most adorable little expressions and words for things."

Then, asked which other charming pieces of lingo he's picked up on over the years, the movie star admitted he loved the word 'chuffed', adding: "We don’t have anything like it in the States, nothing."

But what else does he like to say?

Kieran mentioned the likes of 'chinwag', for a conversation with someone, 'sunnies', for sunglasses, and a 'brolly', for an umbrella.

He then laughed: "The most adorable thing is that you guys say is poo.

"The cutest sentence I think I’ve ever heard anyone say is. 'I done a poo.'"

Asked what the alternative would be if his children did the same in the States, Kieran then set the audience into a fit of laughter.

"They s**t, I don’t know!" he shouted.