A younger brother or sister.
di Stan 10 ottobre 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.
di Ilisten2Metal 16 ottobre 2014
(noun)

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

Because... You parents liked sex.
di TheBubbies101 27 agosto 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.'
di I Love Grimbling 13 aprile 2008

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