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5.
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
 
1.
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
 
2.
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
 
3.
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
 
4.
A foursome involving 2 girls and 2 guys. The 2 girls are on all fours facing each other and making out. Meanwhile each guy is behind one of the girls doing her from behind.
While visiting London Bob and John saw the London bridge where they met 2 girls who showed them the REAL London Bridge.. behind closed Doors
by Cooter King November 01, 2006
 
6.
Similar to the Eiffel Tower but involving two guys and two girls. Each guy is doing each girl in the ass while the two girls are facing each other and are making out.
One time I saw a porno and it had the London Bridge
by AzzPounder May 27, 2010
 
7.
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.

--Wikipedia
The London Bridge is an iconic symbol of the beautiful and historic city of London
by sjssmarts July 02, 2014