Other persons better thinking just verbally slapped you. Used sarcastically to indicate that one is unable to argue against another's absurd logic, or a witty point.
Bart: I want to go with you, Dad.
Homer: Don’t you have school?
Bart: Don’t you have work?
Homer: Ah, Touché.
Homer: Don’t you have school?
Bart: Don’t you have work?
Homer: Ah, Touché.
by anailuJ October 04, 2006