Mystery meat was weird looking inexplicable icons that you had to click to find what they do or hover to get a description. Sometimes, including in both those references, they extend it to be cases where the inexplicable icon doesn't even exist and a description is invisible until hover. The hover patter, what you call scrubbing, seems to me to be related to but different from mystery meat, which is characterized by seeing a navigation element and saying "What on earth is that supposed to be?"
http://www.webpagesthatsuck.com/mysterymeatnavigation.html http://en.wikipedia.org/wiki/Mystery_meat_navigation
Mystery meat was weird looking inexplicable icons that you had to click to find what they do or hover to get a description. Sometimes, including in both those references, they extend it to be cases where the inexplicable icon doesn't even exist and a description is invisible until hover. The hover patter, what you call scrubbing, seems to me to be related to but different from mystery meat, which is characterized by seeing a navigation element and saying "What on earth is that supposed to be?"