The phrase "earthly idea" means having knowledge or understanding that is limited to the physical world we live in, without considering things beyond it like spiritual or otherworldly concepts. Full definition
No on earthly idea where that came from, but I'm rolling with it.Aside from it being one of those songs that just makes you feel all warm and fuzzy when you hear it, it's a good reminder that perspective is everything and if (more like when, because that's life) we find ourselves in a place we aren't too keen on, it's up to us to make the necessary (and often times uncomfortable) shift to get where we need to be. (26andnotcounting.com)
Holds that Matthew, Mark, Luke and John wrote the gospels, when Biblical historians are virtually united on the fact that we have no earthly idea who wrote them, but that it almost certainly wasn't that 4. (religion.blogs.cnn.com)
I have no earthly idea if they even offer any sort of affiliate link program. (eatliverun.com)