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."
E: "I know. It was wicked. Today I am completely briefcased."
by Rockafrosh November 8, 2011
Get the Briefcasedmug. 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.
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.
by Markamello October 26, 2017
Get the dubbo briefcasemug.