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When a woman is preforming the art of "salad tossing" and one's self relieves himself by releasing an excrament of his own natural gas (farts) into her mouth. Usually preforming the London Fog Horn will leave the recipiant in an irate state of mind and has been know to lead to a violent reaction.
I was watching this porno when this dude gave this bitch the "London Fog Horn" and man did she get pissed off! Man that shit was funny!
by Billy Bingham November 09, 2006
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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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2
During fellatio the recipiant jabs the donor's chest directly between the lungs. The donor then reacts by expelling a prolonged deep tone, comparable to that of a fog horn.
Last night my boyfriend gave me a London Fog Horn. It woke my grandmother up.
by Garyland May 29, 2008
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