the word 'windjammer' is a compound formed from two english elements. literally, it denotes something or someone that 'jams' or contends with the wind. its primary nautical sense, referring to a large sailing ship, emerged in the late 19th century, humorously suggesting these vessels were so large they could 'jam' or block the wind. the secondary, colloquial sense for a long-winded, boastful talker developed through metaphorical extension, likening such a person's relentless speech to a ship dominating the wind.

Structure: wind + jam + er wind (old english; the natural movement of air), jam (of uncertain origin, perhaps imitative; to press or squeeze tightly), er (old english; agent noun suffix, indicating a person or thing that performs an action).