someone who annoys you, loves you and is always there even when you don't particularly need her
she spilled orange juice over my new shirt, yea that's my little sister.
by dr. gerbil January 5, 2017
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An annoying 8 y/o who will do anything to get on your nerves.
“My little sister is such a pain in the ass
by ThatBitchAT May 18, 2021
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October 16th is National Little/Baby Sisters Day!! post about your sister and try to get along with them:)
“hey today’s National Little Sister Day so today i won’t antagonize you🤍”
by upstateny518 October 16, 2020
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The Britanic sank in ww1 by a mine. And the Olimpic is in a privately owned dock owened by some random millionaire
Titanic's little known sisters the Olimpic and Britannic lasted longer than the Tittanic. ( just resently they found the Olimpics number plating is found in the Olimpic which can mean a cover up might of happened
by thecanadianninja January 15, 2019
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when a girl feels like she annoys everyone she talks too, the fear of being seen as an irritating burden
Sarah has an awful case of little sister syndrome, she wont tell me what’s going on
by cemeterydoll December 1, 2022
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A really fucking annoying person that is someone's younger sibling and is a girl at the same time. Usually annoys the shit out of their older sibling and the older sibling's friends.
Boy1: Holy shit, your sister is so fucking annoying.
Boy2: I know right? I wish I didn't have a little sister.
Boy1: Yeah, she always walks in on us when we're playing games and she never fucking leaves us alone.
by lolimaginebeingaretard March 25, 2023
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You're probably here because you got into a fight with your little sister and so you searched this up to see what Urban Dictionary has to say for you. Well let's see...

A human being who has been tormenting you ever since it has appeared on this earth. Someone who has been annoying the crap out of you and getting you in trouble for no reason whatsoever. Someone who pretends to be a saint but in fact is quite the opposite. Nevertheless you still care about them even if you keep on telling yourself just how badly you want to slap that brat in the face, but without getting in any form of trouble though.
Person 1:

*Wants to use perfume*
*Sees that it's empty*
"Lili, what did you do with my perfume?!"
*Walks over to her bedroom*
*Notices little sister trying to hide something in a rush*
"What is that?!"
Person 2:

"I'm making a bubblegum scented air freshener..."
Person 1:
*Notices a cotton pad literally dripping with perfume with a small flower cellotaped to it*

"Are you insane?! You wasted all of my perfume!"
*Slaps her, just a little bit*
Person 2:
*Starts crying like as if she hit her so hard*
"Mummy!"

See this is what I'm talking about. They constantly annoy you until you can't hold yourself together any longer.
by BlueMoon~ November 2, 2021
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