A sibling who you do not have the same parents as. HALF siblings either have the same mother only, or the same father only.
Since Wendy and Sally are sisters, and they do not have same father, they are Half Siblings.
by Fame Hungry June 17, 2009
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1. what happens when the older sibling beats up the younger one because it is a culturally accepted ritual

2. when older siblings buy booze for younger siblings and get them stuff that is otherwise illegal.

3. when older siblings are worshipped because they're cool and tell their younger siblings about life and how to get girls, etc.

4. the best bond in life
1. 'Ow i have so many bruises from our latest sesh of sibling bonding!' -younger sibling

2. "Ye-yeahh i was enjoying some sibling bonding with my older sister and she gave me a bottle of smirnoff and this funky herbal stuff.'

3. 'My little bro loves me because we always have sibling bonding and i tell him about stuff that our parents wouldn't."

4. 'I love sibling bonding.....my life is complete now.' -both parties involved in SB.
by bossyoldersib November 03, 2010
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When you discover that one of your parents has had sex with the parents of someone you know, that person is now your semen sibling.
I kept wondering why dad keeps on giving rachel wierd looks, turns out he fucked her mother and we're semen siblings.
by Shalmanese October 21, 2006
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A brother or sister with whom one has incestuous relations.
Travis: Did you see Bobby Sue and Billy Ray lookin' at each other like that? It was really weird.
Clint: P'shaw, don't you know, they're Siblings with Benefits! Stay away from their trailer when their mama's workin' at the Tyson factory on Saturday nights, I tell you.
by ClimbingTheLog June 11, 2008
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A general term used for a man and a woman who share or have shared sexual partner(s) of either gender
As Tina tells Ron about how bad Tyrone was in bed, Ron responds, "My experience was quite the opposite."
They giggled into the night about being eskimo siblings.
by 2tyronefers April 13, 2014
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Pretty much the Brother Zone and Sister Zone mashed into one convienient term.
Jen told me she liked me like a brother. How the fuck do you get out of the Sibling Zone?
by Mofos in the Zone November 05, 2009
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