Bend wookie

Can someone tell me what it means by "bend one's wookie"

This, I believe, comes from a Simpson's episode. It is the episode where Ralph has a crush on Lisa. Toward the end of the episode, Ralph...who was carrying his Star War's diorama that he had made for his school science project..clumsily tripped and smashed his project..when he got up he said, "I bent my wookie." He, of course, was talking about his Chewbacca action figure..but it has another meaning..and has been used by Simpson fans since...