Lady Gaga's 'Poker Face' had explicit lyric which only one radio station realized

It turns out that Lady Gaga's 'Poker Face' isn't as innocent as it seems and only one radio station caught on to the rather X-rated lyrics.

But most people won't know that the song should have been censored on radio stations world wide - the radio stations included.

With this in mind, it turned out the song's X-rated lyrics had been playing for millions to hear. Oops.

The radio station was KIIS FM, and the 'Just Dance' hitmaker went on to applaud them for being the only ones to spot it.

Speaking on stage the KIIS FM's 2009 Wango Tango, Gaga told the crowd: "KIIS FM is the smartest radio station in the whole world, and I'll tell you why.

"Because [Poker Face], it got played all over the world in thousands and tens of thousands of radio stations but KIIS FM is the only one that said I had to censor my lyric because they thought I might be saying something bad."

She went on to note that of all the places that played the song 'KIIS FM is the only one that was right'.

Now which part is the rude lyric, I hear you ask?

The song actually goes 'p-p-p-poker face, f-f-f**k her face (mum-mum-mum-mah)' - and people are floored.

The clip of Gaga admitted the lyrics being X-rated has been doing the rounds online and social media users have voiced their shock.

"Well I was today years old when I learned this and I’m 29," wrote one surprised Gaga fan.

"I can't unhear it now," said another, while a third added: "My past whole teen existence is shooketh."

Someone else went on: "You're telling me child me was singing this song wrong at the top of my lungs not knowing."

Elsewhere, others insisted that they always knew they were the right words.

"And people always told me I was crazy when I said that was the lyric. WELL GUESS WHO WAS RIGHT," fumed another.

Someone else continued: "I thought everyone could hear it, but everyone always argued with me!"

You learn something new every day!