n. A trunk that is mounted in the front of a vehicle.
2016
It's one of two external storage cubbies the Model 3 offers, with a trunk at the back and a "frunk" — or front-mounted trunk — up where the engine would regularly be in a gasoline car.
2015
First, let me begin by saying I was one of the people who really didn’t mind the fact that the i3’s front storage compartment (affectionately called the “frunk” by many since Tesla initially coined the term for the area under the hood of the Model S) wasn’t waterproof.
2007
All the seats, except the driver's, fold down and can be removed, and once out they can be stored in the frunk (front-trunk) or in the rear cargo area.
2003 (earliest)
Step 3: Now we need to remove the latch that opens the front trunk (frunk). Pull back on the latch to get access to the two phillips head screws. Remove these screws, taking care not to drop these screws down behind the carpet. Now we can slide the frunk latch out of the way.
A Tesla Model S showing off its frunk. Source: Wikipedia