A sarcastic remark to a pointless endeavour.

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.

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.

A sarcastic remark to a pointless endeavour.

Not to be confused with good lick, this phrase bids a person with positive farewell and hopes they do well in any situation they may or may not have gotten themselves into.

Phrase where you don't really care what happens, you're just glad it's not you who has to do the said person's task.

This shows that courtesy is not dead. It's a very elegant urban code for, "I DONT CARE" but more accurately,"I REALLY DON'T GIVE A FLYING FUCK".
In some communities it means "YEAH, LIKE THAT'S GOING TO HAPPEN". So if something actually does happen you can never be called out and say it never happen.