Prep and heat grill or grill pan over medium flame. Cut avocados in half and remove pits. Brush flesh of each half with a bit of avocado oil then do the same to the ear of corn.
Place the ear of corn and the avocados, flesh side down, onto the grill surface and allow to cook for about five minutes. Turn corn halfway through cooking time.
Meanwhile, dice red onion into half-inch pieces or smaller. Chop cilantro, seed and chop jalapeño, and cut lime in half. Remove corn and avocado from grill and set aside to cool for about 10 minutes.
Scoop cooled avocado out of skin into a large bowl and slice kernels off of corn and into bowl. Add red onion, cilantro, jalapeño to bowl. Squeeze lime juice over top.
Use the back of a spoon to smash the avocado to your desired consistency and mix all of the ingredients together. Add sea salt to taste as you go. Serve with chips.