a mondegreen of sorts?

Perhaps the word came from a mondegreen? Someone mis-heard or mis-spoke and it transformed from land lover to land lubber.

None the less, the only time I've ever heard it before was on cartoons or maybe commercials for seafood restaurants. In either case, not highly literary situations, and not directed to well educated people. Certainly not from PhD's to a scientific forum in a discussion of when plants or fungi left the oceans. I have never seen this word used in this sort of situation.