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4.
A sarcastic remark to a pointless endeavour.
"I want to move to Hollywood in attempt to marry a movie star!"

"Yeah? Good luck with that."
by Wize One July 12, 2008
 
1.
a phrase used to wish someone well in an endeavor

sometimes a pointless phrase if the task at hand does not even remotely involve or require luck.
good luck washing those dishes. i hope the knives don't fall on your foot and slice your toes off!
by Insufficient Postage February 02, 2006
 
2.
Simple phrase used to catch out British spies or agents when masquerading as the enemy. When wished 'Good luck' in English by a foreign agent they find it literally impossible not to reply with 'Thanks old bean!' or something similar.

Most famously used in The Great Escape.
Hans Nazihausen: Halt! Sprechen sie Englisch?
John Smithson: Nein! Der English sind Schwein-poopen.
Hans: Haha, Ja. Good luck.
John: Thanks old bean!
Hans: AHA!
John: Oh bother.
by Horace Wimp January 13, 2008
 
3.
A sarcastic remark to a pointless endeavour.
"I want to move to Hollywood in attempt to marry a movie star!"

"Yeah? Good luck with that."
by Wize One July 13, 2008
 
5.
A sarcastic term of endearment
"I'm trying to shoot at the Arclight"
"Haha, good luck..."
by ehannah October 23, 2008