Coquito is NOT like eggnog although many people compare the two! The name coquito translates to "little coconut" and it's a rich, creamy, coconuty rum drink that is served during christmas in Puerto Rico.
If you're really interested, Google recipes for Coquito made with Nutella, Pistachio, Chocolate or Cookies & Cream. The pistachio is superb! (And that's a lot coming from a non-drinker!)
Hope you find it interesting enough to give it a try and if you do, let me know how you like it!