A younger brother or sister.
додав Stan 10 Жовтень 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.
додав Ilisten2Metal 16 Жовтень 2014
(noun)

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

Because... You parents liked sex.
додав TheBubbies101 27 Серпень 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.'
додав I Love Grimbling 13 Квітень 2008

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