Biden's very vulgar nickname for Trump: Book reveals potty-mouthed president, 81, constantly drops F-bombs

President Joe Biden likes an f-bomb and he drops the four-letter explective often in his private conversations, a new book reveals.

In his forthcoming book 'War,' Bob Woodward chronicles Biden's personal and political struggles and takes a look at the president's blunt, profanity-laced assessments of fellow world leaders, including Israeli Prime Minister Benjamin Netanyahu to Russian President Vladimir Putin.

And it's not just world leaders.

Biden has a special nickname for his predecessor in the Oval Office. He calls Donald Trump 'that f***ing a**hole,' CNN reported, based on excerpts from Woodward's book. 

Netanyahu also sparked Biden's anger. While the two are reported to have a strained relationship, Woodward shows just how much the Israeli Prime Minister infuriates the American president, leaving Biden f***ing furious.

'That son of a bitch, Bibi Netanyahu, he's a bad guy. He's a bad f***ing guy!' Biden told associates.

Biden expressed continual frustration with the Israeli prime minister as the war in Gaza heated up and spread into Rafah, a southern area filled with refugees. 

'He's a f***ing liar,' Biden said of Netanyahu after that invasion began. The prime minister had repeatedly vowed to raid the area no matter what, claiming Hamas leaders were hiding there. 

Biden also took out his anger on Netanyahu directly. 

'Bibi, what the fuck?,' he said to him, after an Israeli airstrike killed a top Hezbollah military commander and three civilians in Beirut.

Biden also tried to warn Netanyahu that Israel was losing credibility in the world and was being seen as a 'rogue' actor.

'We saw an opportunity and took it,' Netanyahu replying. 'The harder you hit, the more successful you're going to be in the negotiation.' 

Biden was trying to rein in Israel amid worries the fighting would ingnite an all-out war in the Middle East.

The White House downplayed the book's revealations.

The leaders 'can have very honest and straightforward conversations' and U.S.-Israel ties are strong, spokeswoman Emilie Simons told reporters on Tuesday.

'We're not going to comment on each anecdote,' she said of the book. 'I don't have a comment on those specific anecdotes.' 

The president also repeatedly expressed his frustration with Putin.

'That f***ing Putin,' Biden said in an Oval Office meeting not long after Russia's  invasion of Ukraine. 'Putin is evil. We are dealing with the epitome of evil.'

Biden also complained that Barack Obama didn't do enough to stop Putin in 2014, when the Russian leader invaded Crimea.

'They f***ed up in 2014,' Biden said. 'That's why we are here. We f***ed it up. Barack never took Putin seriously.'

Biden added, 'We did nothing. We gave Putin a license to continue!' 

He continued: 'Well, I'm revoking his f***ing license!'

And Biden even expressed frustration with his own Cabinet. 

While publicly Biden has distanced himself from the Justice Department investigations of his son Hunter, privately he was furious with Attorney General Merrick Garland. 

'Should never have picked Garland,' Biden told a friend. 'This is never going to f***ing go away.'

Hunter Biden faces federal sentencing on violating gun laws with a purchase of a hand gun and for failing to pay all his taxes. The White House has said Biden will not pardon has son. 

Woodward's book comes out October 15th. CNN, The Washington Post and the New York Times all obtained early copies.