It means molester moon from smosh.

when ever u send this 🌚🌚🌚 to someone else they get a
series of emojis from molester moon of how hes gonna kill u
Ian: "im gonna call the cops"
Anthony: "u do that amd i'll send u the molester moon"
Ian:"u dont have the guts"
Anthony: "oh really?"
*sends 🌚🌚🌚*
Ian: "u idiot, you've doomed us all!"
*sends 🌚🌚🌚*
by Jason,,. March 13, 2016
Get a 🌚🌚🌚 mug for your buddy Nathalie.