An expression used as a nonsequitur response to annoy someone. I.E. someone asks you a serious question and you say "poopaddies" in a childish voice while staring blankly with an idiotic hypnotic smile. Usually has to be repeated several times to get a real blow up.
An interest in photography, solely for the purpose of taking pictures of recent offspring -- a hobby typically abandoned once the child has entered its awkward stage.