1. British, Australian, N.Z., South African. The hinged metal part of a motor vehicle body that provides access to the engine.
2. Any of various hats, especially worn by women.
3. Scotland. A soft cloth cap [old French – bonet]
Popping the bonnet doesn’t quite sound the same as popping the hood. I always thought of a hood as something you wear over the head, but used in this way, ‘popping the hood’ definitely has more of a ring to it than ‘popping the bonnet’.
Then we have the ‘trunk’, or the ‘boot’ as we prefer to call it over here.
Trunk sounds more logical than boot. I mean, how many people store things in a boot, aside from eccentrics living in solitary up a mountain somewhere.