Where's your briefcase? 

To ask someone how old they are or point out their immaturity.

Dude 1: watch me smash this fly with my face.
Dude 2: Your in high school man grow up.
Dude 1: NEVA!
Dude 2: Where's your briefcase?

Where's your briefcase? by Gnar Cakes October 23, 2008

Scouse briefcase 

A plastic shopping bag, likely to be from such supermarkets as ASDA or Netto. Used to carry a variety of non-shopping items, eg. books. Once they fall into disuse they can be seen blowing aimlessly in the wind.

(At an Everton match) "Get that Scouse briefcase off the football pitch!"

Scouse briefcase by Bruin Suiker April 19, 2010

short Ghanaian briefcase 

To refer to someone who is short with a big bum, love of eggs and attitude

Look at you, short Ghanaian briefcase. Kmt
- Uma

short Ghanaian briefcase by TheUma August 25, 2022

Negaunee Briefcase 

A Negaunee briefcase is a term used to describe a 24 pack case of cheap beer such as Labatt Blue. In the rough-and-tumble mining towns of Michigan's Upper Peninsula, people overconsume cheap beer on a daily basis. A Negaunee briefcase is perfect for your next business meeting in Upper Michigan. First coined by geographers at NMU in 2008.

The three of us Yoopers pooled our money and bought a Negaunee briefcase to drink while sitting on the shore of Lake Superior. At 24 cans, we each have 8 cans to consume in the next couple of hours. If we wanted to drink more, we would've bought the 30-pack of Labatt Blue, occasionally referred to as an Ishpeming briefcase.

Negaunee Briefcase by mtu=sausagefest May 14, 2009

Briefcase Monger 

A watcher of the Wafflin’ podcast

Are you really a Briefcase Monger if you don’t watch every Sunday - ya know.

Briefcase Monger by Waffler123456 April 25, 2021

Briefcase Buddies 

A term used by Sam-I-Am showing his excitement that he and his new "bestfriend" have matching briefcases. "Briefcase Buddies" is a term coming from the show "Green Eggs and Ham" marking the "friendship" of Sam-I-Am and Guy-Am-I.

Sam-I-Am: Oh wow! Look at this! We're BRIEFCASE BUDDIES!!! It's like finding a matching so flake...
Guy-Am-I: It's an Unremarkable attaché, sold in most major stores.
Sam-I-Am: AND WE BOTH BOUGHT IT!!!

Briefcase Buddies by terribly_innaccurate May 19, 2021

Internal briefcase 

The type of turd which is so vast and substantial that relieving yourself of it is comparable to putting down a heavy briefcase you have been carrying all day.

Person 1: 'Hey are you ok? Whilst you were upstairs I heard a colossal thump.'

Person 2: 'Don't worry, I just dropped my internal briefcase.'

Internal briefcase by freshpot September 9, 2011