In my opinion to the moon is mean the price will increase up to 5 till 10 times, and all good fundamental crypto has opportunity to do that, when crypto has possibility to going up to 100 times people will say going to the Mars. Moon is more near than Sun and Mars so that mean will be more possible to reach it.
It doesn't matter how you call that as moon,mars ot etc. Every people has their own joke to this word. But the common person are more familiar with the word of moon.
You can try to replace the word of moon with pluto too but that depends on your self what ever you called it.