Definitions

1. noun

a device attached to a ship or boat to scare birds from flying over the water

“The grogger on the sailboat helped deter seagulls from landing on the deck.”

2. noun

a person who intentionally hits or distracts another person, especially a musician or singer, to disrupt their performance

“The grogger in the audience kept hitting the drummer’s cymbals to disrupt the concert.”