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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.
Sibling by Ilisten2Metal October 16, 2014
A person that you love and hate at the same time.
Sibling: Hey, can you clean my room?

You: of course

You POV: He or she Is so dead after this!
Sibling by xakirax11 August 3, 2021
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.'
Sibling by I Love Grimbling April 13, 2008
a highly annoying individual, that cry a lot and snitches
Sibling by x.emzie January 20, 2017
The worst and sometimes best thing that could ever happen to you.
Oh that must be her sibling
Sibling by Africantrash June 13, 2018
a devil sent from hell to punish you and ruin good times of life.
My sibling got me grounded.
sibling by lifemaker November 20, 2018