In Dublin slang it means a night of mayhem. Gaff means house, therefore by the end of the night of drinking/taking drugs/ talking rubbish to people you don't know, the house or flat will have been destroyed. You must say it in a grating working class Dublin accent for full effect. Since Dublin clubs close ridiculously early, people are forced to gather in someone's house or flat (often someone they don't know at all but that's not important) and drink and take drugs until a) everything is gone b) they pass out or sometimes c) wait until the off licences open the next day so they can start wrecking the gaff even more.
The man is having sex with the girl doggy style, her hands firmly planted on head board, when shes about to cum, he knocks her hands away, "train wreck-pile up"into the headboard.
I was loving this girl till she called me the wrong name, so I used " the trainwreck" on her.
A term used for dropping a huge number 2 in a toilet and completely ruining it for any other person who will attempt to use it.
Kevin Murphy (as Bella) - "Well, seeing how we wrecked the bedroom; it only makes sense to wreck the can!"
Bill Corbett (as Edward) - "WAY AHEAD OF YOU ON THAT, HONEY!
- Kevin Murphy and Bill Corbett, former stars of cult classic Mystery Science Theater 3000 during the Rifftrax of The Twilight Saga: Breaking Dawn Part 1