Discuss and learn French: French vocabulary, French grammar, French culture etc.
It's the first time I see this expression. It really exists and means that you don't have the sense of repartee.
It's seldom used.
I just asked a friend from France. He says it's what you should have said but didn't think of until later. The explanations are similar. Merci,Erwan.
Yes it's this meaning, but in fact we never use it.
Actually, this if the first I saw it. ;)