1.freight train riding term where the train you are on goes onto a side track to let another train pass it.
2.when used like "going into the great hole in the sky", it is a train hopper who gets killed while hopping trains.
1. "shit, were going into the hole, i'm gonna get off and take a shit"
2."man, mike should be more careful"
"you can bet he's going to the great hole in the sky"