Means, a force to be reckoned with, or some imminent event that will bring forth much rewards.
That Jack and Jane, they are fuckin' deadly in scotland, like a haggis holocaust.
by Pehlte April 20, 2006
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1. A fart that sounds like a whisper, where in fact, it is a deadly release of methane from the deliverer's ass. Perfect for parties, movies, and first dates!
Jane Smith dropped a deadly whisper in the movie theater and was arrested and charge with 387 counts of murder.
by Its George Yeah July 26, 2007
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A mistake made which results in something potentially dying. It's a pretty gosh darned awful mistake if that something turns out to be you. There are two deadly mistakes which are incredibly common;

1) A woman, in the midst of her mental cycle is being somewhat emotionally unstable, and a man utters these words....."what's your problem?!" DEADLY MISTAKE!!! The obvious answer to the question will be that HE is the problem, and if he escapes with his life, all happiness will most certainly be killed for him for the next 3-5 days.

2) When getting down to some serious foreplay, the woman turns to the man and utters these words..."do I look fat?" DEADLY MISTAKE!!! There is no "safe" way for a man to answer that question! If he looks, he's judging- if he doesn't look, he's not taking the question seriously- if he says yes, she cries- if he says no, she says he's lying.... Apart from that question being the one that probably makes men want to strangle women, asking it will kill desire stone cold fucking dead. Not to mention that a "yes" response might result in someone finding the guy the next morning with his head torn off.
"She was just nagging and whining and bitching, so I asked her what her problem was!"

"Ahh, that explains the bruises. Deadly mistake, mate."

"She asked me if she looked fat, right when I was about to take her from behind!"

"Gaaah! Deadly mistake! I bet that killed it!"

"Too fucking right, I was too stressed even to wank, and she just led there muttering and texting about what a cold hearted tosser I am"
by MagickDio April 1, 2010
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When im ing or texting and one person toalty stops talking making it very awkward
Fred-yo did u get the time fore sallys party to night?
John-no we were in the middle of the canversation and she gave me the deadly silence
Fred-Damn that sucks
by VMIman January 29, 2009
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obligatory centrifuge one finds themselves on after getting "drunked up" -the rotating voice informing one, 'ITS' PUKING TIME, DUDE!!' -arrival of the knowledge its' time for one to find a 'safe' place to puke!!
dean thought he was going to end the night 'clean', until it became clear he had the deadly spins!!
judy has just bared her tits and was dancing, when she became damned by the deadly spins!!
by michael foolsley January 24, 2010
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The one place in norcal called Davis, protected by an agricultural buffer located and 15 miles west from reality. Its a hella white ass town.
dood1: I gotta go down to Deadly City to put on my punk rock radio show.
dood2: Man,... Davis is such a white ass town, all the cultured people must have been killed on porcelain porches.
dood1: yeah i know, it creeps me out, like the dead.
by cliffy300 May 7, 2009
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