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Shitting trains means you're the best. You're the king of everything. Nobody can touch you. You're like the god of school, the boss of lunchtime, and the reason why everyone else is crying in the bathroom.
You shit trains because you got straight A's and also won the spelling bee.
You shit trains because you ate the last slice of pizza and didn't even share.
You shit trains because you beat the principal in a dance-off.