"silly duffer brother" or "SDB" for short can be used as a noun or adjective to describe an extremely idiotic person (also a nitwit or fool) or an extremely idiotic action.
SDB combines Aussie slang (duffer) and incorporates a reference to the world renowned Duffer Brothers (American twin brothers who write and direct science fiction films, horror films and television shows - including Stranger Things).
SDB combines Aussie slang (duffer) and incorporates a reference to the world renowned Duffer Brothers (American twin brothers who write and direct science fiction films, horror films and television shows - including Stranger Things).
Girlfriend: "I can't find my phone again!"
Boyfriend: "It's in your hand you silly duffer brother (SDB)!"
Boyfriend: "It's in your hand you silly duffer brother (SDB)!"
by Horatio Bumbus July 26, 2017

by Ryan Sandstede April 5, 2019

An ingrained fear reaction that younger siblings show towards an elder. If properly nurtured can result in reactions such as flinching when the older sibling walks past even though the younger is taller, bigger and stronger and 18+. This can also result in a defeatist attitude and outcome when in confrontations with the older sibling.
Luke was a victim of little brother syndrome. Even though he was bigger, stronger, faster and a black belt in karate he could never defeat his older brother in a tickle fight. Luke is 20 years old.
by Rincow May 4, 2011

When an older sibling brings a best friend into their home and the littler sibling thinks said person is their new friend and tries to impress them/flirt/or just won't leave you too alone for any reason
Your little brother has "Little Brother Syndrome" when he keeps trying to show your best friend his vast collection of Hot Wheels, even though said friend doesn't care and you both want him to go away.
by Dr. Upin Disbich July 19, 2015

I totally rubbed one out to Greg's sister last night; that makes him my eskimo brother in-law now right?
by the leagueeee December 21, 2010

Friend 1: "Bro, you lose your v card last night?"
Friend 2: "Fuck yeah man! I'm a big boy now!"
Friend 1: "Bro, I did too!"
Friend 2: "No fucking way! We're V Card Brothers!"
Friend 2: "Fuck yeah man! I'm a big boy now!"
Friend 1: "Bro, I did too!"
Friend 2: "No fucking way! We're V Card Brothers!"
by Charles andrew July 3, 2014

MIKE: Hey Honey, this is John, my side step brother.
HONEY: Okay, you already introduced me to your "bridge brother", who is your half brother's half brother, so I am going to guess that your side step brother is your step brother's step brother.
MIKE: You are a VERY good guesser, and YES you are correct, except that I don't have a step brother, I have a step sister.
HONEY: Oh. And when do I get to meet her?
MIKE: She is over there (Mike points). Let's go. Come on John, let's go see Sharon.
HONEY: Okay, you already introduced me to your "bridge brother", who is your half brother's half brother, so I am going to guess that your side step brother is your step brother's step brother.
MIKE: You are a VERY good guesser, and YES you are correct, except that I don't have a step brother, I have a step sister.
HONEY: Oh. And when do I get to meet her?
MIKE: She is over there (Mike points). Let's go. Come on John, let's go see Sharon.
by Shelly Bozdog June 30, 2006
