An actor who has been taking breakaways for a long time.” Breakaways, in turn,are defined as “Object, light and fragile, with which an actor can be hit without severe injury.”

While such props do less damage than a real chair/bottle/etc. would, the accumulated blows definitely do a lot of damage. The derivation is not given, though it may be related to the name Yakima Canutt (see above).