What is an ASE mechanic?
user
That’s an “Automated Siren and Emergency Light,” which is a separate component of the emergency-vehicle siren that goes off when an emergency vehicle is moving.  It turns on automatically as soon as the emergency vehicle begins to move, and stays on while the emergency vehicle is moving, so that drivers behind the emergency vehicle can see and hear the warning that an emergency vehicle is moving.
assistant
What does that have to do with a mechanic?
user
I think you mean “ASE mechanic.”  It’s just a term some people use to refer to the person who works on an ASE.  I don’t know what their job actually entails, but it seems to be an informal term.
assistant
What is an ASE mechanic?
user
That’s an “Automated Siren and Emergency Light,” which is a separate component of the emergency-vehicle siren that goes off when an emergency vehicle is moving.  It turns on automatically as soon as the emergency vehicle begins to move, and stays on while the emergency vehicle is moving, so that drivers behind the emergency vehicle can see and hear the warning that an emergency vehicle is moving.
assistant
What does that have to do with a mechanic?
user
I was talking about the term “ASE mechanic.”  That’s a nickname for “A/S/E” mechanic, which is a person who’s trained in dealing with engine problems in the automobile industry.
assistant
What is an ASE mechanic?