The term is usually meant as a cheap firearm that you dont care if it gets a little scratched up or rusty.... High Points are a good example of one... and yes, it can be left in the vehicle all the time basically, or you can bring it in every night, up to you... Interchangeable terms could be "tool box gun"... or "Tackle box gun"...
To pick up on that,
what for?
I assume that it should be a cheap firearm in case it gets stolen. I assume that it should be a firearm that you dont care if it gets a little scratched up or rusty, because it actually might. Yes, Hi-Point firearms fit exactly in this description. (I assume this meant a Hi-Point pistol caliber carbine.)
However, I would never rely on a Hi-Point pistol caliber carbine for self defense for multiple reasons, including reliability, usability and being the wrong tool for the job. If a cheap beater gun is really the main objective, then a used Remington 870 or S&W M&P 15 will do a better job.
But then again, what is that job the gun should fulfill anyway? Should it be easily accessible by the driver or not. Should it be usable while driving? Is is supposed to be used when leaving the vehicle behind and continuing by foot? What about ammo? Bird shot, buck shot and/or slugs, or how many mags.
One of the reasons why I made the comment about having a "truck gun" for the sake of having a "truck gun" is that there needs to be some thought put into this. Otherwise, you are just a guy driving around with a useless gun in your vehicle with a high level of confidence.
My recommendation, AR-15 pistol in .300 Blackout with a 9"-12" barrel, a Shockwave blade, a single/double point sling, a red dot and supersonic soft point ammo. Yes, that's possibly a $1000+ gun. However, this will be the most versatile solution.