I did a search! Couches 102, 103, 106, 107, AND 108 did not have the word!

For those keeping score at home, the word was introduced by then-hankster to the PC universe in July 2011. It has been the subject of a poem by our very own Artemis. Its first Couch appearance was Couch 79. It was only after its use on Couch 99 that it really took off. Wonder why?