Y.C.S.S. (Younger Cuter Sister/Sibling Syndrome)

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)

Y.C.S.S. (Younger Cuter Sister/Sibling Syndrome) by Discobeck August 28, 2018

Sibling Simp (Sibmp) 

Someone who does way too much for a sibling

Minerva is always making sure her siblings every needs and desires are met without hesitation. Clear example of being a Sibling Simp (Sibmp).

Sibling Simp (Sibmp) by Onesoda September 4, 2021

New sibling syndrome 

When children who have recently acquired a younger sibling feel so excluded that they pretend the new member of the family simply doesn't exist.

Mary: "Who is that?" (motions to John's younger sibling)
John: "What are you talking about? I don't see anything."
Mary: "Oh John, I forgot you are still suffering from new sibling syndrome."

New sibling syndrome by yepyepyepyepyepyepyep February 2, 2014

Second sibling syndrome 

1. Always craving the attention the first born sibling recieves from parents; wanting the recognition from parents; Always striving to "one-up" other sibling, to hopefully recieve attention from parents.

2. Usually has some degree of rebel in them; mostly in the wrong when in altercation with first sibling.

3. Willing to fight to the death over petty things to show parents that first sibling is in the wrong.

4. The cure for this syndrome is when the First sibling leaves the household, therefor leaving parents to become attached to Second sibling, until First sibling returns to home for a short stay(s).

Joe: "Mom, I swear to moses Mark punched me !"

Mark: "Mom, I would never do said thing, you know that, don't you"

Mom: "Of course hunny, I can not believe I am even questioning your integrity."

Mark: " Thank you, Joe is just going suffering from Second sibling syndrome."

Second sibling syndrome by TPBruso February 25, 2010

sibling second 

A non gender specific synonym for the popular expression "bruh moment".

Person 1: Dude! What a bruh moment!
Person 2: Hey man, we don't discriminate in this household.
Person 1: Oh sorry, I meant to say sibling second.

sibling second by some_idiot_called_jay April 14, 2019

national your little sibling sucks day 

July 26th, national your little sibling sucks day. this is the one day of the year when your little sibling has to admit they suck. It's the law. they also HAVE to mean it.

My little sibling must now admit they suck because it is national your little sibling sucks day,

national your little sibling sucks day by Elia Al-Nims July 24, 2021

Sibling sucker 

One adult child whose siblings allow, by deferment, silence, or proximity, to assume and shoulder the predominant responsibilities of caring for an aging parent.

A sibling sucker with no time to call their own, can grow to be an angry angel.

A sibling sucker is usually performing one of the most difficult and thankless jobs on the planet.

A sibling sucker spares brothers and/or sisters of their equal responsibility which might "God forbid" interrupt their busy lives.

A sibling suckercan be one whose halo has fallen a few inches to become a noose.

Sibling sucker by Catholic Devil May 4, 2009