The US president is using his final months in office to photobomb weddings and settle a couple of old scores …

In the US, they call it the “senior spring” – the last semester of the last year at college when your work is done and a Cancun cocktail bucket beckons. In the Washington, they are also calling it Obama’s Year of DGAF (“don’t give a -” Google the rest), when Barry O decided to flip the First Bird at diplomacy and the dignity of office to become banterer-in-chief.

The president returned to Jimmy Kimmel’s sofa this week to chat and read out more mean tweets about himself. This time he included one by Donald Trump. “President Obama will go down as perhaps the worst president in the history of the United States!” Obama said. He added before dropping the mic: “At least I will go down as a president.”

Facebook Twitter Pinterest Obama on the Jimmy Kimmel Live! show. Photograph: Kevin Lamarque/Reuters

Obama has little time for the Republicans who spent eight years demonising and obstructing him. After Congressman Darrell Issa tried to pivot from his support for Trump by including Obama’s picture and kind words in a campaign mailout, Obama called him “shameless” at a fundraiser last weekend. His crawling was “the definition of chutzpah”. Pick that one out, Darrell.

Obama is notorious for turning up late to stuff, a trait he turned round to campaign for Hillary by pleading with Americans to vote early by post. “My greatest strength?” he asks in the clip. “Probably that I’m always early.”

Last week, Obama sat down with a clueless careers adviser to discuss his future job prospects. “I don’t see any promotions for the last eight years,” the adviser (Stephen Colbert) said. “There wasn’t a lot of room for advancement in my last job,” Obama replied. “Do you have any awards or commendations …?” “I did get the Nobel peace prize.” “Oh really? What was that for?” “To be honest I still don’t know.”

Facebook Twitter Pinterest Obama in Marc Maron’s garage. Photograph: Pete Souza/The White House

No studio is too small for chat-shObama. He talked to Marc Maron in his garage and last December shot the breeze with Jerry Seinfeld in Comedians in Cars Getting Coffee, more than proving his chops alongside the king of comedy.

If there’s a subspecies of Republican that Obama particularly enjoys dissing, it’s Trump flip-floppers. Last week he laid into Senator Marco Rubio who called Trump a “dangerous con artist” in the primary battle but now supports him. “C’mon, man,” he said at a campaign event for Clinton and Rubio’s opponent Patrick Murphy.

Wedding crashing is what celebs do, most recently a jogging Tom Hanks, but when Obama spotted a ceremony on a San Diego golf course late last year, he couldn’t resist a bit of presidential scene stealing, presumably to the dismay of his security detail.

With one executive gag earlier this month, Obama managed a pop at at least three different people. Referring to Kanye West’s purported presidential ambitions, he warned Mr Kardashian: “First of all, you’ve gotta spend a lot of time dealing with some strange characters who behave like they’re on a reality TV show.”

Obama is still president, and Putin is still his biggest foe, but nothing gets in the way of a gag. In March, Obama remembered a conversation with Putin about the Russian’s negative portrayal in an article about Obama. “Unlike you, Vladimir, I don’t get to edit the piece before it’s published,” he recalled telling him.