Fergie is well known for having had extensive dental work in the U.K. Therefore her 'london bridge' is simply a british dental procedure. Being located in her oral cavity explains why it will 'go down when you come around'.
You have some spinach stuck in your london bridge.
by CrackWholeSaler September 24, 2006
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London Bridge – the cleavage between a woman’s breasts.

London, London, London (v.) – the act of doing a “motorboat” to breasts.

You london-london her breasts, when you kiss the London bridge and utter “brbrbrrrr” imitating a motorboat.
Meanie: Dude, do you know the fergie song – london bridge?
Smartie: And?
Meanie: I think she meant an orgy, by saying london bridge.
Smartie: “London Bridge” does not mean orgy or legs-widespread or pussy or whatsoever!
Meanie: What does london bridge mean then?
Smartie: London Bridge was downed by fire. When someone makes your "London Bridge fall down", they are making you very hot. (sexual.) In the song by Fergie of the same name the music starts with fire sirens. "How come everytime you come around my London Bridge wanna go down?" equates "How come everytime I see you I wanna get off?"

Meanie: Nah man you kiddin! London bridge is cleavage, and girls get off when you do london-london-london to their breasts! It’s like motorboat, you do brbrbrbr like a motorboat to the london bridge.
by Dickie Greenleaf October 18, 2012
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What ignorant Americans call Tower Bridge.

People of America, listen up while I drop some science:

The Bridge in London which is impressive to look at and had a Tower (hint) at each end is called Tower Bridge. London Bridge is actually a few hundred yards to the west, and looks like nothing much actually.
1. In 1968, an American, Robert P McCulloch paid $2.5 million dollars to buy London Bridge under the mistaken belief that he was buying Tower Bridge. The then London Bridge was taken down, transported to America and reconstructed at Lake Havasu City in Arizona. (A new London Bridge was opened in London in 1973). D'OH!!

2. The bridge that is seen in the video to London Bridge by Fergie is actually Tower Bridge. D'OH!!!

3. British people still laugh about Americans not knowing the difference between the two. :-)
by Dr Pinch October 4, 2006
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Derived from the jingle "I see London, I see France, I see someone's underpants", London Bridge is the middle area of a female's undergarments.
In Fergie's song "London Bridge" - how come everytime you come around my london, london bridge wanna fall down?
by tha street August 2, 2006
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When two girls have sex with one guy. The guy lays on his back, one girl sits on his face, the other sits on his dick...then they high five....it's a reverse Eiffel Tower.
Paolo got London Bridged last night by Brandy and her mom!
by Lambokaos August 7, 2016
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A london bridge occurs when one or two people are dancing between two people who are holding hands dancing, just like the game.
Let's go london bridge Suzy. She's dancing all alone.
by Tahi December 20, 2006
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Its a sexual term to describe a woman when she is in an excited sexual state. Her clit and labia become erect. Fergie's song parallels this to a the two sides of a draw bridge coming down.
From Fergie's song:
How come every time you come around, my London London bridge wanna come down....
by jctimothy February 2, 2007
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