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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?"
by James Cobalt July 28, 2006
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London Bridge refers to several historical bridges that have spanned the River Thames between the City of London and Southwark, in central London. The current crossing, which opened to traffic in 1973, is a box girder bridge built from concrete and steel. This replaced a 19th-century stone-arched bridge, which in turn superseded a 600-year-old medieval structure. This was preceded by a succession of timber bridges, the first built by the Roman founders of London.1

The bridge is the subject of the popular nursery rhyme London Bridge Is Falling Down.

The London Bridge is an iconic symbol of the beautiful and historic city of London
by sjssmarts July 02, 2014
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London Bridges (noun.) 1. Panties. The use of this metaphor (london bridges) as an alternative for the word panties was introduced in 2006 by Fergie of Black-Eyed-Peas.

In her debut song, "London Bridges", Fergie makes the following context;

'How come every time you come around
My London London Bridge wanna go down'.

Abstractual concept - (Imagine how one's panties would slip of both legs evenly, they would form a bridge.)

2. Can also be a reference to implcating intercourse (depending on word usage) ie. "I want to get into her London Bridges".
"Look at the size of that girls booty, damm, I can't imagine a london bridge big enough to fit her"

"Why don't you drop the london bridges, so we can get busy?"

by Darryl Learie aka nine9nine9nine9 September 13, 2006
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The true "London Bridge" occurs when two girls are being done doggy style, facing each other and making out while the two lucky men high five over them.
"London Bridge is falling down, falling down, falling down..." So many people get the Eiffel Tower and the London Bridge mixed up that they get caught up in the specifics and forget to sauce the girls.
by Brendan Butler April 19, 2006
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The gender role reversal of the Eiffel Tower. The man positions himself in a back bend stance between two women, the first of which stands over his groin to accept the penis, the second of which stands over his face to accept cunnilingus. The two women may then hold hands or high five to complete the top of the bridge. Also called the London Bridge because it is the Queen’s sex position.
Guy 1: dude my back hurts so bad from London Bridge-ing Jen and Ann this morning.
Guy 2: What’s a London Bridge?
Guy 1: It’s like an Eiffel Tower, but better.

Daniel London Bridged the fuck out of us yesterday, it was awesome. I hope Alec does it tonight.
by ZaddyZick69 May 20, 2018
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A meaningless, vaguely sexual term used by Fergie in her single of the same name, invented simply to stir up discussion about an otherwise forgettable and derivative song.
How come every time you come around my London London Bridge want to go down?
by Kevin Salinas July 27, 2006
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