A hybrid between an ambulance and fire truck (pumper). The Ambulumper, thought to be cost-saving by combining two pieces of expensive equipment and reducing manpower, is really nothing more than an embarrassment and denial by the fire service that EMS is swiftly taking over.
See also; Pumpulance.
Dude! There was a rocking trash can fire around the corner from the fire house. We would have been fighting the beast if we hadn't been taking some shitbum to the hospital in the Ambulumper.