In a large bowl, mix the mangoes with the avocado, green onion, cilantro, and shrimp. Pour in the vinaigrette and give it a good toss. The salad is best served cold, so if you are not serving it right away, allow it to chill until then.
2 avocados, ⅔ cup green onion, ⅔ cup cilantro, 1 lb peeled cooked shrimp, 2 large mangos