The Centurian shakes was a medical condition.

In 2268, Montgomery Scott, after returning to his Starfleet uniform, commented that the outfit he had worn while undercover as a pirate was beginning to give him the Centurian shakes. (TOS comic: "The Flight of the Buccaneer")

"Centurian" is presumably an alternate spelling of "Centauran" or "Centaurian".
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