The media nickname given to the offspring of Katie Holmes and, purportedly, Tom Cruise. A play on TomKat, in the highly irritating style of combing the names of high-profile celebrities who are dating, such as Bennifer (Ben Affleck and Jennifer Lopez). Also the first sign of the Apocolypse.
When the revolution comes, people who say stuff like "TomKitten" and "Brangelina" with anything less than withering contempt will be the first up against the wall.
Derived from the popculture term "Tomkat" (which refers to the Katie Holmes and Tom Cruise pairing), which is part of the greater trend of combining celebrity couples names (eg: Brangelina, Bennifer, etc).
Tomkitten refers to the newborn child of this celebrity couple.