Specifically refers to the bombardier beetle, especially Pheropsophus jessoensis, known for ejecting a hot chemical spray.
See also: ミイデラゴミムシ
The bombardier beetle is famous for spraying hot gas from its rear.
Also used for stink bugs, though this usage is less common and may be regional or older.
See also: カメムシ
In some regions, stink bugs are also called ヘッピリムシ.