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1. Technical term used to describe an especially attractive alpha of the species. Commonly used in chat rooms.

2. Colloquial for a statement that makes one appear as an attractive alpha of the species. Frequently, it is used as a double-meaning replacement for another common word in the sentence.
"You're sibley the best!" "I believe that makes her sibley irresistible."
by The Springtime Front February 04, 2010
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Jul 12 Word of the Day
The horrible moment when you realise that you have accidentally done something very slightly wrong which has very bad (usually embarassing) implications for you. This is typically the moment of realisation that you just sent a dirty text message to a close member of family, typically your mother, rather than the intended recipient.
Message: "i'm free this afternoon so come over and fuck me senseless, my parents will be out all day"
Recipient: Mum
Message Sent
- Onosecond occurs here -
by Jimmed September 26, 2006
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adj. whose sole action in life is to irritate/bother/annoy/piss off/send others into a homicidal frenzy. Has the power to annoy inanimate objects.

2.derogatory term for an extremely effeminate male, especially one working in Computing Services.
"Dude, stop being such a sibley, you're really pissing me off!"

"Look at that sibley--he sure is girly."
by The Caring Souls June 09, 2004
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A Missourian "village" with less than 2 entire people living there. Sibley consists of:

An orchard
A power plant
Fort Osage
Ex-fire department
Post Office
Water department
Ex-honey bee farm
~300 people.

The "best" place in the world to live.

Situated 3 miles away from the hip and happening town of Buckner (they have an entire 2,000 people!)

Gotta love Missouri. MO. .. .. Missouruh. Never come here, please.
*Picks up phone to call and ask for directions*
"How do you get there?"
"Well, you're gonna go north by some orchard *notices HUGE FUCKING SIGN ABOUT ORCHARD 2 miles north* .. then turn right and right again by "the big yellow building" <--- this is proof that you've entered Hicksville. People here don't use street names, they use "the yellow building."
"So, how's Sibley?"
"Fucking sucks."
by Jeremy S July 24, 2006
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