What does touch-et mean?

It's Touché (French pronunciation: [tuʃe])

the French Word for "touched" is used to acknowledge a hit[1], called out by the fencer who is hit. Conversely, if a fencer concedes a hit when no hit was actually made, the fencer's adversary would say, "'pas de touché'" (French pronunciation: [pɑ də tuʃe]; English: no touch) to indicate that the hit should not be counted.

In other Words, a remark hit home when bantering