The Mobile Crime Scene is usually a dilapidated RV that runs well enough to move its tweaker occupants to various locations around town. RV's are preferred since their classification as a "home" makes search warrants more difficult to obtain. The term can also apply to creepy cargo vans or other vehicles that look to be used for nefarious purposes.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.