When a member of the opposite sex (or same sex) declares you to be "brother/sister", thereby ruining all potential chances of sex.
Guy: Would you like to go out with me?
Girl: I'm sorry, but you're like a brother to me.

Sibling-zoned!
by LanaDangerZone April 1, 2012
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A member of the ape species Annoyus Stupidus, this animal is treated by parents as god, and cannot make any mistakes (even though they do). They possess the evolutionary ability to shift all the blame to the Older Sibling. This means that whatever they do, whether it’s starting an argument, attempted murder, and the like, it’s your fault.
“But moooooooom, he started the fight!” “Shut up you stupid bitch! He’s the younger sibling, you should’ve known better!” “But he...” “I don’t give a shit who started what!”
by Lifefuckingsucks January 15, 2018
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The unspoken rule that what is said between siblings about parents or other siblings, stays between siblings. It's like the man code or the bro code, but with siblings. It's like Vegas. People who violate this unspoken rule are considered untrustworthy. Breaking the code is akin to betrayal. The phrase is never said out loud unless it is being explained to someone who for some reason did not become aware of it through osmosis or other siblings' example.
Sibling1: "Dude, you can't tell Mom I said this, but she's a little oversensitive."

Sibling2: "Mom said it wasn't nice that you called her oversensitive. Then she cried."

Sibling1: "Are you freaking kidding me??!!! Look, I thought you would have gotten the hint by now, but there's this thing called the Sibling Code..."
by YourSister July 25, 2013
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Siblings that fuck each other. Brothers on Sisters, Sisters on Sisters, Brothers on Brothers, Brothers on Brothers while their Uncle watches from the closet.
Setting: Father of 2 daughters at bar with a friend.
Father: “I walked in to my oldest daughters room Late last night to borrow her iPad & witnessed both of my daughters in bed in the ‘69’ position. WTF???
Friend: “Sounds like you’ve got a case of ‘Sibling Fucklery’
by Litcunt February 4, 2020
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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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