I encountered this while reading Astérix. The Gauls have had their village surrounded by a Roman palisade, and several of them attack the southern portion while Astérix leaves the village by the north.
After the fight, a Roman soldier comes running up to his comrades, lying bruised and broken on the ground, and tells them there's a breach in the northern palisade and that this fight was only a diversion. One of the soldiers on the ground replies "Une diversion? T'as de ces mots!!"
What does this mean? "You have some of these words" obviously makes no sense.