I first heard about this cocktail on Chincoteague Island, VA at a restaurant (no longer open) called Jackspot. This is my take on the cocktail. Rather than using artificial lime juice and triple sec I have subbed fresh lime juice to equal parts simple syrup and club soda instead of Sprite.
1 1/2oz Whipped vodka
1 oz fresh squeezed lime juice
1 oz simple syrup (or agave)
Top w/ club soda
Garnish w/ a dollop of cream and lime wedge
Prepare in a 16oz glass (pint or plastic). Combine all ingredients in order and flip once. Finish with whipped cream and a lime wedge.