noun
peashooter
A toy gun that shoots dried peas or similar small projectiles. Also used figuratively in the idiom 豆鉄砲を食ったよう (looking dumbfounded, as if hit by a peashooter).
子供の頃、豆鉄砲で遊んだ。
When I was a child, I played with a peashooter.
突然の知らせに、彼は豆鉄砲を
At the sudden news, he looked as if he'd been hit by a peashooter (dumbfounded).