Gibb Sahib said (some time ago)
Step 1: Cite where the phrase "roll and go" actually occurs.
Step 2: Give the necessary context surrounding those occurrences.

Heave a pawl, oh heave away,
Way, hey, roll and go.
The anchor's on board and the cable's all stored,
To me rollicking randy dandy oh.

Dunno the provenance of that one, but it's sung in the revival.

Seems to refer to starting a voyage. Note the word "randy". Maybe reminiscing about sex the night before? "Roll" as in "rolling in the dew", "roll in my sweet baby's arms" etc. "Go" simply referring to leaving the wife/girlfriend/whore and going back on board ship.