A younger brother or sister.
po Stan Октобар 10, 2003
A creature sent to earth to remind you that your parents are still having sex.
"Dude, congrats on your new sibling!"
"Man, don't remind me! All that means is my parents had sex at least 9 months ago."
po thedifinerofdefinitions Јануар 12, 2015
Someone who came out of the same vagina as you, and can either be a boy or a girl.
my sibling is playing my video games on my Xbox.
po Ilisten2Metal Октобар 16, 2014
(noun)

Reminders your parents had a lot of sex...
Why do I have siblings???

Because... You parents liked sex.
po TheBubbies101 Август 27, 2014
From the infinitive 'to sible' (pronounced 'sibble'), meaning to perform some form of sexual act with another persons brother or sister (preferably younger for greater novelty value...though not TOO much younger). For clarity in use, the given example would mean that to sible 'her', would be to sleep with 'her' sibling.
'Dude, I would totally sible her...soon as her younger sister's street legal of course.'

'For sure dude! I'd give her the sibling of a lifetime.'
po I Love Grimbling Април 13, 2008
a demon that make you want to rip your own ear off and shove it up their fucking ass
My goddamn sibling is running around the house and since she weighs 400 pounds the whole house is shaking
po waffles.and.weed Јануар 9, 2015

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