Samuel L Jackson to Obama: 'Be f*****g presidential

Samuel L Jackson has blasted Barack Obama for dumbing down the way that he talks to normal Americans, telling the political leader to 'be f*****g presidential'.

The Holywood legend, who publicly backed Obama's reelection campaign in 2012, said he is frustrated with the way the head of state talks, questioning why he chooses to drop  the letter 'g' from the end of his words.

In an astonishing rant, Jackson, 64, said that President Obama was trying too hard to 'relate' to normal people instead of being true to who he really is.

But the attack has been described by some as 'ironic' after the Pulp Fiction star agreed to appear in a video caled 'Wake the f**k up. Vote for Obama' during the last election.

Speaking in an interview with Playboy magazine, the actor questioned the president's reasons for changing his speech, saying: 'First of all, we know it ain’t because of his blackness, so I say stop trying to "relate".

'Be a leader. Be f*cking presidential. Look, I grew up in a society where I could say “It ain’t” or “What it be” to my friends.

Edition: Jackson was talking in an interview in October's of Playboy magazine (stock picture used)

'But when I’m out presenting myself to the world as me, who graduated from college, who had family who cared about me, who has a well-read background, I f*cking conjugate'.

Jackson, himself a graduate having studied acting at Morehouse College, Atlanta, said he gets annoyed when high profile figures try to talk in 'street language' to appear cool.

He continued his rant by saying educated men like the president who actively try to speak less correctly encourage mediocrity.

He said: 'The other day I’m watching this white guy talking to black people on TV, and all of a sudden he’s saying stuff like “Pump your brakes” and “I got you,” these new politically cool terms that kind of came out of hip-hop and blackness.

'I’m thinking, We do still speak English, right? Though sometimes I wonder. So yeah, it still happens. But the whole language and culture are different now.

'I’ll be reading scripts and the screenwriter mistakes “your” for “you’re.” On Twitter someone will write, “Your an idiot,” and I’ll go, “No, you’re an idiot,” and all my Twitterphiles will go, “Hey, Sam Jackson, he’s the grammar police.”

'I’ll take that. Somebody needs to be. I mean, we have newscasters who don’t even know how to conjugate verbs... how the f*ck did we become a society where mediocrity is acceptable?'

Jackson's assault on the president's choice of language seems rich given that he has become one of the most well known exponents of profanity in movies.

His foul mouthed Obama reelection video was based on a book which had previously narrated called 'Go the f*ck to sleep, by Adam Mansbach.

Jackson also famously owns a lightsaber, which he kept after starring in the Star Wars films, with the initials 'BMF' inscribed onto the handle. The letters are known to mean 'bad mother f*cker'