KITTONITE (N.) ‘kit-tun-nyt The sapping, debilitating, life-destroying force that kittens and cats can exert on a relationship when one of the partners dislikes, resents and shuns all creatures of the feline persuasion. Usage: Rob and Neil went out for a few months, but only a couple of weeks after Neil adopted an adorable Burmese kitten, Rob vanished, never to reappear. Neil hadn’t anticipated that furry young Titus would be kittonite to the relationship, but he rationalized that Rob was kind of a jerk, anyway.