1 definition by James Cobalt

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 29, 2006
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