The jellyfish shot combines a sickly sweet collection of liqueurs (blue curacao and sambuca) with vodka and a drop of cream to make a cocktail that is gorgeous to admire, even if you couldn’t pay me enough to drink one.
Jellyfish is a nice PC name for this shot. I would call it the Cum Drop. Any bartender that calls it that will sell a ton of them, especially on girls nights or to bachelorette parties.