It was called the TikTok: https://ujeezy-blog.tumblr.com/post/2869125971/unboxing-the-...
But I haven’t heard it in a while.
Agreed, a lot of the alternative usages that people are mentioning seem fake and I don't recall any of them being a thing. The only usage I recall being widespread was people saying tick tock to tell you to hurry up implying that the hands of a clock are moving. That and the little known novel from the 80's about a sentient murderous robot.