What is the definition of Stays Engineering?

"Says nothing, but I bet it's about as likely to break down as a rubber ducky in a rainstorm. So, 'tays engineering' is like that super-strong, silent, and unyielding machine that keeps going even when it's supposed to be the one that's about to collapse under its own weight."

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Example sentence: "Despite the eerie silence, the old conveyor belt in the abandoned factory was still 'tays engineering' – it'd keep churning through the dust and debris without a hint of a whine, just like a bad actor in a horror movie."