What is California Slingshot?
1.
Using the shoulder of a five lane freeway to pass a slow moving car in the left hand lane.  Often this move is made by a 
Son (sitting shotgun): Wow Dad! Look at that BMW pass that car up ahead.
Father (driving): Don't ever do that shit!
Son: Do what?
Father: The California slingshot, son.
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The type of people who care about greenhouse gases and the rain forests and generally just wine about people who don't drive priuse.. 
1. 
someone goes and says or does something that ruins your day
"sorry i can't go this this weekend."
"why don't ..