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2.
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!
by fumbu May 07, 2009
 
1.
Something you wouldn't do when your children are around, on or off a train.
'Man...last night was a trainsmash'

OR

'Excuse me your in my seat, if my kids weren't here there'd be a trainsmash!'
by loltown.com August 05, 2009
 
3.
when you mix (or "bash") two foods together
"anthony says food at cadet camps is always trainsmash"
by jacqui michelle August 15, 2006
 
4.
regional dialect (crawley, sussex)

slang for "its no big deal"
"shame you cant give me a lift to the pub, but its no trainsmash"
by bbcks July 21, 2005