I saw that expression in a book ("Earth to Baker!), and in a title of UCC (earth to America), and some blog (their name are "earth to David", "earth to Luisa" etc.)
how about this one;
David was next to giddy about the group all being in touch with each other via phone."
(Context: The system had been out of order so they couldn't have used their phone. At last the system became normal situation. )
-What does David was next ti Giddy means?