Proverbial strategic distraction device. It is a projectile that contains special ops trained kittens that eject and distract the targets then retreat back to home base eluding tracking. In extraction: an extremely cute distraction.
A beautiful girl passed me on the street and threw me a kittenbomb with her eyes and before I knew it I walked into a trash can.
A new topic introduced into a conversation which has the effect of causing the participants to stray from the previous course of the discussion and causes multiple digressions to occur.
A student in a graduate seminar prefaces his contribution to the discussion by saying, "This might be kind of a topicbomb, but it might be pertinent."