Well, it sounds like they are talking about an out-the-front switchblade, but there was the Tekna back in the 80's. I have one kicking around the house somewhere--when you push the button the plastic sheath retracts into the handle exposing the blade. Kind of stupid, but as a teenager back then, I HAD to have one.
at least someone has heard of what they mean.
but why such things aren't just classified as "Switchblades" is beyond me.