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8.
A younger brother or sister.
od uživatele Stan 10. Říjen 2003
 
9.
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.
od uživatele Ilisten2Metal 16. Říjen 2014
 
10.
(noun)

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

Because... You parents liked sex.
od uživatele TheBubbies101 27. Srpen 2014
 
11.
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.'
od uživatele I Love Grimbling 13. Duben 2008