The gentleman's "Fuck you motherfucker"

A quick and curt way to end a conversation, putting a thin polite spin on the rude abruptness.

Most uses of this phrase are referencing actor Gene Wilder's portrayal of Willy Wonka in the 1971 movie "Willy Wonka & the Chocolate Factory," where Wonka informs Charlie he has lost the contest because he drank the burp soda, a breach in the contract he signed. "You lose! Good day, SIR!" Wonka screams at Charlie before turning back to his desk.

Linking to an animated gif of the scene with the audio intact is a popular way to assert you are done with an argument on the internet.

One day, two marijuana enthusiasts smoked some rather potent weed. This weed did things to them like nothing they had ever smoked before. At the end of the night one of the stoners dropped off the second stoner, but before driving away he shouted "Good Day Sir" and drove off without saying another word. Ever since that day stoners occasionally use this expression in place of saying "goodbye"

An expression used at any random time to indicate epic fail, derived from Gene Wilder's line in Willy Wonka and the Chocolate Factory.

An insulting end to a conversation.

Up yours.

Legend has it, that a man by the name of Roger Tellenfield was walking by one of his friends one day. His friend looked over and said "I am having a good day". Roger was having a horrible day so he pulled out a gun stuck it to his own head and said "Well good day to you sir" and shot himself. Since then this phrase has been used by many as a good way to end a fight or a good way to say good bye. .