Person A: I got a B on my quiz.
Person B: I got a B+.
Person A: Touché.
Person B: That doesn't even make sense in this situation. Go back to your corner, you little touchebag.
Someone who engages in constant, unnecessary oneupsmanship, always in search for people to say "touche."
Person A: Oh yeah, I hiked all of the Appalachian Trail last year.
Person B: Wow, good job!
Person C: That's nothing, I hiked the Himalayan trail.
Person A: Well, to be fair, I was just recovering from a broken leg.
Person C: I had a broken leg and broke the second one while hiking!
Person B: Don't be such a touchebag.