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Released as The Spice Girls' debut single, the track perfectly encapsulated their motto "girl power" coming out at the crest of a glorious rebirth of British music in the mid-90s — Brit Pop.

But now Daily Star Online can exclusively reveal the explicit messages behind the classic that went on to sell over 7 million copies worldwide by the end of 1997.

An insider, who helped write the song in "a cramped but hip little" studio complex in London's Shoreditch back in 1995, has finally opened up about the secret behind the "Zig-a-zig-ah".

(Image: WENN) (Image: WENN)

He told us: "Most of our studio neighbours were way cooler than us, we had Orbital and Chemical Brothers next door.

"But there was this one 80s pop dude who hated us for encroaching what he considered 'his turf' which was boy bands and girl bands.

"This guy had this nasty habit of taking a dump in the shared khazi while smoking a cigar, so we took to referring to him as 'S**t and Cigars'.

"During the recording this phrase was thrown around a lot and must have worked its way into Mel B's subconscious who pretty much wrote all the lyrics.

"She may have considered 'S*** and Cigar' for a minute – but eventually settled on 'Zig-a-zig-ah' instead."

Probably a good idea as the record, which was named the catchiest ever single by a recent university study, went to no1 in 37 different countries.

It doesn't end there with the smut, and we're not talking about the nipples poking through the girls' tops which lead to the video being banned in some parts of Asia.

The same spicy insider revealed Wannabe also contains a lyrical reference to two of the girls "enjoying sex whilst on ecstasy, if you listen carefully".

The raunchy lyric comes as Mel B introduces the girls in the middle of the smash hit.

"We got Em (Baby) in the place who likes it in your face," she sings innocently enough.

But then: "We got G (Geri) like MC (Sporty) who likes it on an E."

Listen to it now. It's there.

The Spice Girls are rumoured to be planning a reunion tour for the 20-year anniversary of Wannabe in July making it a scary fact that most of Little Mix were only two-years-old when it was released.