So ~~ jubilee or jubilo or juba or jube-jube - all words of pleasant/lively connotations, hence 'she' being a popular or proper one

or gibre or some such, part of ship's rigging on which sailor's could jump for certain navigational purposes

or conflation of these into a whack-the-fol or ee-i-ee-i-ay sort of chorus locution ~~

but how odd that these should have been confined to variants of this one song, or at most two, rather than spreading further...