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1.
You miss one class or lecture because you don't feel like it or it's at an inconvenient time for you. Then you start skipping all the classes related to that subject and eventually you're bunking important lessons.

It's the so called bunking train because you hop on the train at the station and it starts to pick up speed. No one ever tells you that it's headed to Failure City.
"Haha, sounds like you're on the bunking train."

"I know, I skipped stats and now I don't want to go to maths. I'm fucked, oh well."
by Y-Dawg! February 21, 2012