This feature of the game has been Removed. There may be changes in the future that will affect the development of certain features of the game.
Meteor Slimes were cut from the game, and the only trace of their existence was in the Slimepedia Page of the Silver Parsnip before it was added as its favorite.
It was planned to be added in 0.6.0 However, the devs stated that the slime wasn't working. Parts of it will be repurposed for the other new slimes, most likely Fire Slimes, But it's possible that it might come back in a future update, as unfinished code for the slime can be found within the game's files.