What's a 'blunderbuss'?

Manlicher Blunderbuss by hunterkiller on DeviantArt

Lion's Head Blunderbuss Flintlock Wood and Metal Replica Pistol 16 Inc —

An Indonesian blunderbuss

Four barrel blunderbuss : r/ForgottenWeapons

Image of Blunderbuss (photo) by English School, (18th century)

flintlock blunderbuss rifle from Afghanistan No: GW-13

A fine antique 18th Century French Flintlock Blunderbuss, signed GOESIN A PARIS, muzzle 37 mm, length 70 cm, in very good condition. Price 4.250 euro - Long Guns - Bolk Antiques

Spec Ops Review And Test A Vintage Blunderbuss

Flintlock Blunderbuss Pistol Framed Print by Paul Ward - Fine Art

Rise of the Halflings: Dragon Goads and Halfling Blunderbuss - Printable Scenery