I've taken to saying "gee whillakers" at the drop of a hat. It's never really been in my cache of exclamatory phrases, so I have no idea where it's coming from. I do know it saves me from saying "god dammit" when I trip on the sidewalk, or "asshole!" when a guy on a bicycle almost runs me down. "Expletive deleted" is what I really mean to say, but that takes more effort than "gee whillakers."