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Youngsters in secretive North Korea are using a secret underground sex app to mock Kim Jong-un.

The teens are escaping the watchful eye of tyrannical officials by logging onto Yik Yak.

It lets users post anonymous messages from anywhere in the world that can be seen by those within a five-mile radius.

One youngster logging on from North Korean capital wrote: "Any Korean girls down to f***?"

"Someone meet me on the 24th floor of the Pyongyang Hotel."

The underground social network is also filled with posts mocking dumpy despot Kim Jong-Un and urging him to "go on a diet".

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(Image: PA)

Others have branded the dictator a "liar" while mocking his bizarre haircut - which he has ordered men in the secretive nation to copy.

One sneaky user knowingly said: "We can mock Kim Jong Un in his territory without his army even knowing about it.

"I wonder if he has ever considered downloading Yik Yak to see what people post in Pyongyang."

Anti-capitalist officials will be furious that the technology is being used to poke fun at their leader.

Internet access is heavily locked down in North Korea and is mostly for foreigners visiting the country.

A think tank source said: "North Koreans have been ordered to crack down on capitalist ideology and culture."

But observers wouldn't be surprised if it was Kim Jong Un himself logging on to the app organising hookups.

His womaniser dad Kim Jong Il was accompanied everywhere by a 'Joy Brigade' tasked with keeping the dictator pleasured.

Yik Yak has faced repeated controversy amid fears it could be used for cyberbullying.

Its developers were forced to disable the social network at primary schools because young kids were using it to abuse their classmates.