For this trophy, you need first to become suzerain of the City State La Venta. Check  New Orleans Style Spanish Rice to learn how to do that.

Once suzerain, you have the ability to build colossal heads throughout your territory using your builders. What you need to do is build one of these on a tile adjacent to a Holy Site that has a Temple improvement. Temples are built from the respective city's production tab after researching Theology.

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FYI - This trophy is a reference to the TV show of the same name, which originally aired on Nickelodeon from 1993 to 1995. The show was a children's competition of six teams of two players each, took place in a fictional temple, and featured a giant talking Olmec stone head statue who pointed the contestants towards the treasures hidden in the temple. This, in turn, referenced the old pre-Columbian city of La Venta of the Olmec civilization, mostly known because of the four colossal heads carved in stone and almost 3m (10ft) in height.