LtS may have something there.
Most of the "navy" men were from Cornwall, Devon etc, their accents would render normal verbal comunication into a series of ooooh's and arrrgh's to someone speaking the Queen's (King's) english! If you are thinking in terms of Pirates, cannonfire and boarding parties swinging across from ship to ship, it would probably be the "aaarrrrrrrgh" often heared which translates into "oh god i'm gointodiehelpmeplease!!!!!" or the "oh shit iv'e been hit by musket shot and the doc will have to cut my leg off"