Trainwrecking: The reaction one has when faced with a totally unexpected situation in which one doesn't immediately know how to respond.
"Dude, I totally dumped my half caf low fat soy latte on that Barista; she's totally trainwrecking"!
DJ lingo for one of a DJ's worst nightmares, when two songs are mixed together but don't match up. Creates an ugly offbeat mess.
Oh my god, that DJ was trainwrecking so badly!! I was gonna kill that guy...!