"Flash grenades" refer to small explosive devices that emit a bright flash of light and loud noise to disorient or temporarily blind people in specific situations, such as law enforcement or military operations. Full definition
In Portland, police used flash grenades to disperse demonstrators. (bbc.co.uk)
For scientists, the FRBs were as blinding as flash grenades in a dark forest; their power, brevity and unpredictability simply made it impossible to see the source of the light. (quantamagazine.org)
It's true he has a habit of deploying sexually - charged flash grenades that seem designed, first and foremost, to stun you into submission. (lwlies.com)