It's a word coined by the friend who set up my Gmail account. We'd had some banter previously about Trillian, one of the characters in Douglas Adams's classic "The Hitchhiker's Guide to the Galaxy." This friend began to call me Trillian, later shortened to Trill. I surmise that "trillenator" is modeled on "terminator" and I view my e-mail name as a symbol of one's ability to travel anywhere, at least in one's imagination. On the other hand, perhaps my friend was teasing me about being a destructive force to the threading at the mailing list we both belonged to at that time.
Example sentence: My friend Trill is an inveterate trillenator, hijacking threads and rushing about the universe, even where angels fear to tread.