A made-up Irish term by the most amazing guy I've ever known.
A soddy bott is a negative person, a party pooper. They always see the glass half empty.
The term can also be said to confuse a fellow American.
Me: even though I seem like a negative bum
Him: in Ireland we call it a Soddy Bott
Me: xD Soddy Bott
Him: I completely made that up...