Suffering from can't be arsed syndrome means you can't be arsed to do anything. A general lack of motivation to do basic tasks. Taking it easy. Avoiding heavy work. Finding day to day tasks cumbersome. Used in an specific instance as an out of the ordinary day for someone who is usually hard working.
dude 1: I am suffering from can't be arsed syndrome today.
You are about to get destroyed physically, mentally, and spiritaully. Generally if this phrase is bellowed out it means the bellower is about to engage in a mass slaughter with absolutly no care for their own safety. Expect no quarter given. Although a relitivly rare act, certain social pressures, neurological ihibitors, or defeat in a video game can cause this.
Vavey: Owned you again!
Dave: Now witness the firepower of this fully ARMED and OPERATIONAL battle station!