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 pants can be compared to what we commonly refer to as traditional 'cargo' pants, yet generally they may have a few additional pockets or features. They offer additional spaces to hold things, much like that of cargo pants.
Did you see the briefcase pants a julie was wearing yesterday?!? They were so next level she even had 3 extra crystals, a deck of tarot cards and a stuffed dragon in the pockets! So many pockets!