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Downing Street dismissed on Monday as “nonsense” claims about lewd conduct by David Cameron when he was a university student.

The move came after extracts from unauthorised biography about the UK Prime Minister that includes allegations of undergraduate drug-taking and juvenile sexual escapades set the UK abuzz on Monday.  

The book Call Me Dave: The Unauthorised Biography was co-writtern by a former Conservative Party treasurer, Michael Ashcroft who donated millions to the party before falling out with Cameron. 

Extracts published Monday in the Daily Mail newspaper claim Cameron smoked marijuana with friends — often while listening to 1970s rock group Supertramp.

The book also quotes an unnamed college contemporary as saying Cameron once inserted "a private part of his anatomy" into the mouth of a dead pig during an initiation ritual for a student club. 

Ashcroft says he was offered a junior role in the party after Cameron became prime minister in 2010 – an offer he a "disappointment" but Lord Ashcroft said the controversial biography is not about "settling scores" with Cameron over the snub.  

Downing Street at first refused to comment on the allegations.

The Prime Minister’s spokeswoman she would not dignify Lord Ashcroft's allegations by offering any comment on his book and that the allegations are "". 

The claim have sent Twitter into a frenzy of mockery and disbelief. 

"I've never been more pleased to be a vegetarian,"  Liberal Democrat leader, Tim Farron.

Other social media users expressed their outrage at a perceived lack of coverage by BBC of Ashcroft’s claims.

"Think it's almost funny that our 'state broadcaster' is ignoring news that all the nation is talking about," Scottish National Party member of parliament, Pete Wishart.