Top Definition
Essentially a more widely accepted term for a hangover; one may come down with the "Brown bag fever" only after a night of drinking, hence the term 'brown bag' was coined refering to the brown bag that is placed over alcohol when purchased at a liqour store and 'fever' to refer to the sick, nearly fever-ish feeling one gets from drinking too much.
Boss: Why were you sleeping at your desk this morning?

Employee: Sorry, I just have a case of the "Brown bag fever"
by ClassyGent18 April 27, 2008
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