Touché

LORELAI: The both of you are going directly to hell, I hope you know that.
RICHARD: Well, at least we’ll be well rested.
LORELAI: Touché.

In the sport of fencing, touché is said to acknowledge a hit made by your opponent; it means “touch” in French. In colloquial use, it acknowledges during a conversation that the other person has made a good point at your expense. This is a slight callback to Richard’s fencing prowess in college, mentioned earlier.