Sucu sucu may be related th the American Spanish words "suco"- juice, sap, orange-colored; and "sucoso," juicy, succulent- or it may not. If so, azucar, sugar is the probable origin.

Another suggestion is that the word is related to "sucubo," a Spanish word for "a pretended demon, which, in intercourse with men, took the form of a woman."
Could this idea have been in the minds of the dancers in the Isle of Pines 150 or more year ago?

Definitions from- Velázquez, Spanish and English Dictionary.

It is impossible to attach with certainty meaning to an old word which is local in origin, unless a great deal is known about the local dialect spoken there.