A blunderbuss is an old-fashioned gun with a short barrel that flares out at the end like a trumpet. When fired, it scattered lead pellets or shot in a wide spray instead of shooting a single bullet straight ahead. This made it easier to hit something at close range, but almost useless at any distance.

Sailors and stagecoach guards used blunderbusses in the 1600s and 1700s because the wide spray worked well in cramped spaces like ship decks or coach compartments, where aiming carefully was difficult. Pirates often carried them too. The flared barrel gave the gun an intimidating appearance, which sometimes scared off attackers before a shot was even fired.

Today, we rarely see actual blunderbusses outside of museums or pirate movies, but people still use the word as an insult for someone who acts clumsily or speaks without thinking. If you call someone a blunderbuss, you're saying they charge forward making noise and mistakes instead of taking careful aim at what matters.