A term of endearment most commonly utilized by blond chicks (the kind that may have trouble figuring things as common as a light switch). Someone described as a sninnerdiddle is likened to being as happy as unicorns, sunshine, and rainbows! The best place to spend time with someone who is sninnerdiddle is on a beach front porch at sunrise reading the newest Shauna Niequist novel while sipping a hot, mildly spicy cinnamon holiday tea.