Top Definition
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."
by Rockafrosh November 08, 2011

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