Make the guacamole. Combine the avocados, red onion, jalapeño, lime juice, cilantro, and salt in a large bowl. Mash to your preferred consistency — smooth or chunky, both are great. Taste and adjust salt or lime as needed. Drop one avocado pit back into the bowl to help slow browning.
Grill the corn directly on the grates over medium-high heat, turning occasionally, until charred in spots all the way around. Let it cool slightly then cut the kernels off the cob.
In a small bowl, toss the grilled corn kernels with cotija cheese, lime juice, and cilantro. Spoon generously over the top of the guacamole.
Season the shrimp with salt, pepper, and a drizzle of olive oil. Grill over medium-high heat for 2 to 3 minutes per side until pink and slightly charred. Don't overcook them.
Arrange the grilled shrimp over the street corn topping. Drizzle with bang bang sauce and serve immediately with tortilla chips alongside.