The Nerd Car appeared on The Simpsons: Hit & Run. It was driven by a nerd who loves what ever merchandise Comic Book Guy loves.
You race the car over to The Java Server in the mission "Vox Nerduli", so Comic Book Guy can be the first to register his disgust on the internet.
You also have to race the car in "Nerd Race Queen" were Comic Book Guy has to grab the last copy of the Itchy and Scratchy adventures comic where they both finally kiss.