adj. 1.one 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."
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