bane of (one's) existence
The source or cause of one's misfortune, unhappiness, frustration, or anxiety, usually used hyperbolically. I swear, this project is the bane of my existence. I've been working on it for months and still haven't made any real progress! Jane has been constantly annoying me all week. She's been the bane of my very existence!
rickle o' banes
A Scottish phrase used to describe someone who is extremely thin. A "rickle" is a group of something, while "banes" are bones. You've just become a rickle o' banes during your time abroad, so I'm going to make all of your favorite meals now that you're home.