When we were still in the UK I did a list of things to be done and forgot to type a space between the To and the Do - 'What's a todo (to rhyme with Frodo)'? Mr FF asked me. Since then of course that is what we have called it.
When planning something involving a journey Mr FF likes to add 'wiggle room' - you know, those extra vital hours that are needed to make the difference between cutting it fine and sailing along in a leisurely fashion (although we both have a hatred of being late everywhere and consequently prefer to be the first ones).
When I was a child my mother tried to encourage me to be self-possessed and confident - which she abbreviated to SPC. Even now I sometimes tell myself to be SPC.
Do you and yours have their special phrases? Care to share them with me?