According to claims made in a new biography, Prime Minister David Cameron carried out the act when he was a student a Oxford University.

The book, co-written by the journalist Isabel Oakeshott and Conservative donor Lord Ashcroft, claims that there is even photographic evidence of the Prime Minister putting ‘a private part of his body into a dead pig’s head’.

The book alleges that this was part of a dining club initiation ritual.

Mr Ashcroft said: "Perhaps it is a case of mistaken identity. Yet it is an elaborate story for an otherwise credible figure to invent.

"Furthermore, there are a number of accounts of pigs' heads at debauched parties in Cameron's day."

Sources close to the PM, however, have said that they 'do not recognise' the sensational claims made by Lord Ashcroft, who had a major falling-out with the Tory leader.

But this hasn’t stopped Twitter exploding with #PigGate, #HamGate, #Hameron and #pulledpork jokes.

Hmm. We imagine Prime Minister’s Question Time is going to be interesting this week.

Meanwhile Charlie Brooker, whose controversial Channel 4 programme Black Mirror featured a Prime Minister, Michael Callow (Rory Kinnear having sexual intercourse with a pig on live national television, has since taken to Twitter to deny that he knew about #PigGate when writing the episode.

He said firmly: “Just to clear it up: nope, I’d never heard anything about Cameron and a pig when coming up with that story.

“So this weirds me out.”

It remains to be seen as to whether or not Downing Street - or David Cameron - will comment directly on the rumours surrounding the Prime Minister. In the meantime, Twitter is having an absolute ball at his expense.

What do you make of #PigGate?

Let us know via Facebook or Twitter (@CloserOnline) now.