Definition of "drifty"

The first time I heard them struggling with their electric instruments and singing in cracked falsettos, I imagined a line of fishing boats puttering off into the fogbound sea of a cold New England morn. "Ah, Shrimp Boat," I exclaimed, "what a fine name for sounds so churning and drifty!"

1988 November 18, Renaldo Migaldi, “Shrimp Boat”, in Chicago Reader‎