Derived from the definition "whacker" however the term "dinger" is used more commonly in upstate NY.
Any EMT Firefighter, Rescue worker who enjoys their job simply for the pleasures of:

A - Hearing their own voice on the radio
B - Using the lights and sirens on the ambulance/firetruck
C - Using lights and sirens on their personal vehicle
D - A lifetime subscription to Galls because of the sheer amount of stuff ordered from them
E - Having more stuff on their workbelt then Batman
F - Only showing up (whether they were dispatched or not) for 'good' calls (car rollovers, structure fires, High angle rescues)

Look at how many lights rob anthony has on his car what a DINGER