The younger sibiling shall always embarass the older sibiling and must also rat on them and tell their friends about the older sibilings secrets.
Younger brother to older brothers freinds: did you know that he has wet his bed 10 times this month? I'm required to tell you acorrding to the younger sibiling code.
The younger sibling code: the youngest sibling shot always embarrass the older sibling and must also rat on them and tell their friends about the older siblings secrets
by Bunyguy202 November 21, 2016
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On October 4th, anybody who has a younger sibling can slap them, and they cannot fight back, cry, or complain. They must accept the slap.
Older brother: Hey, guess what?
Younger brother: What?
Older brother: It's Slap Your Younger Sibling Day!
Younger brother: Fine, you can slap me.
by delta! October 4, 2021
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When you have a younger sister/sibling that is better looking than you
Stacie is okay but have you seen her little sister Jessica? Stacie totally suffers from Y.C.S.S. (younger cuter sister/sibling syndrome)
by Discobeck August 28, 2018
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When a younger sibling constantly feels inferior to their older sibling.
there always compared to their sibling, it’s a clear case of Younger Sibling Syndrome
by Imhotandurnot November 15, 2022
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the most annoyingest thingy in whole wide universe
Little Younger Sibling: Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Blah Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak Yak...
Older Sibling: help

basically an anoying family member that bothers you 24/7 that maybe hates you. for real
by chez_plez August 30, 2023
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