Five Seconds of Summer made their debut appearance on the popular British TV show 'Chatty Man' last night (October 9).

Ashton Irwin joked that their record label describes them as "the biggest band that no one's heard of," yet the chat show's host, Alan Carr, quipped that they have been one of the most asked for guests ever on his London-based show.

The boyband were met by a screaming audience, and laughed and goofed around in their usual relaxed way throughout the interview.

Funny man, Carr, questioned them about the most extreme thing fans have ever done, to which they explained about a Las Vegas concert where 50 fans had manged to sneak into air vents, crawl along to get into the venue and slept overnight just to see them, only to be kicked out before the show even started. 

When Carr expressed his disappointment, they added that it was absolute "bollocks". He then asked if they actually used that word in their native country of Australia, to which they sheepishly admitted they didn't, but were 'just trying to fit in'.

During the interview the lads drank cans of beer, chatted about "butt tattoos," and acted out random hashtags, including #SU2C (Stand Up 2 Cancer) and #5SECONDSOF.

The foursome later performed their single 'Hey Everybody' from their new album, which has already shot to No. 1 in 50 countries even before its release.

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Watch the video of 5SOS chatting and performing 'Hey Everybody' on the British chat show below: