In the Terminator franchise, this is often the word used to describe a female Terminator, such as the TX from Terminator 3: Rise Of The Machines, played by actress Kristanna Loken and Cameron from Terminator: The Sarah Connor Chronicles, who is played Summer Glau. They are basically metal femme fatales.
“That Terminatrix is pretty as a picture, yet she’s more lethal than a cobra. In fact she's a 1000 times more deadly than a black Mamba, a great white shark and a 20ft crocodile all rolled in to a 5'4" package. She's absolutely deadly. Yet, if she smiled at you, you wouldn't be able to remember your own name”
by IHeartTheBlackParade June 23, 2009