A jizzlactite is a cave-like formation that is created when one successfully performs a jizz shot that sticks to the ceiling.
-Tour guide, "You'll notice these things that hang from the cave ceiling. They're called stalactites. They are very old."
-Billy, "Is that a stalactite?"
-Tour guide, "Oh my, that's no stalactite. That's a jizzlactite! That must have been from those darn kids in the last tour group!"