The cop's version of going on strike. Since they can't legally strike they all call in sick.
When the city threatened to reduce pensions, the NYPD came down with a bad case of the blue flu.
by Tragic Story December 22, 2004
1 more definition
When the female gender (or male) loves a man in uniform, particularly a police officer.
"Omg Jackie, I just came back from this guys house and he's a cop" Jackie says "so you have the blue flu?"
by Thetwofeath March 29, 2015