Vehicular Mood Slaughter

The act of changing the atmosphere from chatty/giddy/up-high to dark/macabre/and or/demeaning in a single second.

Vince: "High, Karen, how is your day today? You're looking pretty mucho caliente today *wink*"
Karen: "Vince, I really don't have the time for your bullshit today, when you go bungee jumping this weekend, don't forget to cut your cord prior to your jump!"
Vince: "Wow karen, way to just pull a vehicular mood slaughter today, now I feel like shit."
Karen: "Thats because you ARE shit, Vince."