The phrase "bombardier beetle" refers to a type of beetle that can defend itself by shooting hot, smelly chemicals from its body when it feels threatened. Full definition
Successful escape of bombardier beetles from predator digestive systems. (sciencenews.org)
Shinji Sugiura and Takuya Sato of Kobe University in Japan fed bombardier beetles (Pheropsophus jessoensis) to toads. (newscientist.com)
But the vast majority of specimens were inadvertent visitors, such as gall midges, leafhoppers, and ground beetles (like the false bombardier beetle, pictured above), who had wandered in and were likely looking for the exit. (sciencemag.org)