Firefly - Stuck Between Your Teeth

Yeah, you’ve got a firefly stuck between your teeth, Bob.

Any of numerous night-flying beetles that produce a bright, soft flashing light for courtship purposes.

Word forms: plural-flies

1. Any nocturnal beetle of the family Lampyridae, common in warm and tropical regions, having luminescent abdominal organs 

See also glow-worm

2. Any tropical American click beetle of the genus Pyrophorus, esp P. noctiluca, that has luminescent thoracic organs