driver mod
The "modifications" made to a driver's skill set (or lack thereof) to improve vehicle performance. Typically used as a response when someone inexperienced is asking about what vehicle modifications will make their car perform better, instead of improving their performance as a driver.
"Can someone tell me what the best upgrade to help when cornering in my Mustang is? It seems to just keep turning towards crowds of people."
"Yeah, it's the driver mod for sure, you should look at spending on that first."
"Yeah, it's the driver mod for sure, you should look at spending on that first."