A younger brother or sister.
door Stan 10 oktober 2003
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.
door Ilisten2Metal 16 oktober 2014
(noun)

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

Because... You parents liked sex.
door TheBubbies101 27 augustus 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.'
door I Love Grimbling 13 april 2008

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