What is the definition of Twas On That Dark That Doleful Night St Cross?

Let's break this down like a joke at a funeral: "Twas on that dark and dreary night, when the moon had just dipped below the horizon, that a soul so sorrowful and taciturn st cross the grave of forgotten dreams!" Now, here's a sentence that might make you chuckle at the same time: "On that particularly gloomy evening, our friend decided to st cross the grave of his unfulfilled ambitions, muttering about how stars are just too busy staring at each other."