The phrase "riding shotgun for" typically refers to being the passenger in the front seat of a car. However, there are many antonyms for this phrase. If someone is not riding shotgun, they may be sitting in the back seat or even driving the car themselves. Alternatively, they may be taking a different mode of transportation entirely, such as walking, biking, or even flying. Instead of being a passenger, they may be the one giving directions or taking care of other tasks, such as managing the music or providing snacks for the journey. Ultimately, there are many ways to travel and enjoy the journey, and not all of them involve riding shotgun.