A true catastrophe, an outstandingly tragic event. Often used to tell sb they're exaggerating.
A: Oh I've screwed things up! It's irreversible!
B: Don't fret about it babe, it's no train smash.
A: I say guys, I've been kicked out of college for cheating...
B: Sounds like a real train smash dude!
Phrase for using ecstasy pills at once; snort one, swallow one and insert one into rectum (shelf).
I train-smashed three red mitzi's