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?
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Typically found at a school setting he/she is that one overly formal person in the group who fantasizes about their super hot mom and is always found carrying around his trusty briefcase with witch he uses to wipe his own ass.
Man can't this wanker stop acting like a briefcase mong wipe!
A case of Keystone (or Keystone light) beer.
"hey man, I saw your dad walking to his trailer with a Tennessee Briefcase this morning."
In British slang it refers to being hungover from partying/drinking all night. It takes after the concept of the durability of a locked briefcase, being able to drink all night and keep going.
D: "My God, that club last night was the dogs bollocks."
E: "I know. It was wicked. Today I am completely briefcased."
When you have to force laughter in a business setting, most commonly seen in a meeting or walking by someone in the office.
It is similar to Foreskin Chuckle in its deliberateness.
Emmitt The Intern: Does every meeting start with talking about the weather, the latest on Twitter, and gas prices? Also, nobody said anything funny in that meeting, but I think Thompson ACTUALLY pounded the table 3 times.
Sinclair, The Savvy Office Veteran: Yes, it is imperative to Briefcase Chuckle before every meeting, each and every time someone mentions someone else's hometown, and whenever someone talks about their alma mater's rival.
Emmitt: Ahh, thank you for helping me. I really appreciate you showing me the ropes.
Sinclair: Ya, too bad your coach didn't show your boys the ropes last weekend, eh? That was quite a beating we gave you.
Emmitt: Oh Our QB just couldn't get anything going...OHFU...ohhhhhh I see what you did there.
Sinclair: You're Welcome.
Having sex with a girl and realizing she has mold growing on her vagina.
I was doing this girl this morning and I looked down and seen she had a musty briefcase.
Me: Robbo and I are talking business.
Misso: if you're not business Men, where are ya fucken briefcases?
Me: we're gonna pick up a coupla dubbo briefcases from Dan Murphy's on special sarvo.