More involvement from Toyota in how Toyota's are created I imagine (it sounds funny). If i'm not mistaken, currently OEMs basically piece together vehicles largely from offerings from suppliers (e.g. door handles, headlight projectors, etc). More stuff than you'd expect in cars like the Camry aren't actually engineered inhouse.
I imagine ODM is more involvement with the design and customization/origination of those components so you get better, more economic outcomes vs making existing things work.
Please someone correct me if i'm wrong.
This is an oversimplification. Yes, automakers use common parts across multiple model lines but they don't just piece together their cars from commodity parts picked from large bins on the assembly line floor.
All cars go through a long (years-long) and complicated engineering and styling design process, and only late in that process do the engineers do a "buy or build" decision to determine if they should (and can) buy a part (or subassembly) from a supplier, or build in-house. But even if they do buy from suppliers, the automakers provide specifications to suppliers so that the bought-in products are better-suited for a model line(s) rather than being true parts-bin products.
Of course, this process will depend to a large extent on how vertically-oriented an automaker is. Highly-vertically-oriented companies, like Tesla (and Chinese automakers, as I understand it, but I could be wrong) will build more in-house and buy little from outside suppliers. Western automakers like Ford and GM buy a lot from outside suppliers.
Toyota is somewhere in the middle. They do buy from suppliers but their suppliers, especially in Japan, are largely companies that are in the Toyota "family".
Automakers decide on vertical-orientation in large part to keep quality high and to keep costs low; these were the reasons Tesla has given for being vertically-oriented (but I can see how expensive it can be to have to re-invent the wheel every time Tesla has to design and build a new seat, for example, rather than working with a specialty auto-seat maker). Toyota's (and the Japanese and Korean) culture of in-house / in-family suppliers keeps quality high because the automakers maintain control of their suppliers but the suppliers are also able to sell those parts to other automakers as commodity items (thus lowering costs).
GM and Ford used to have their own families of suppliers but divested sold them off.
I still do not know what "ODM" stands for.