The term 'Ceebs' was originally coined in 2009 at Cavendish School. Ceebs is basically how to say 'I can't be assed' with only one syllable, therefore making it effective in emphasising your ceebsness.
In 2011, 6th Form students at Edgecliff High School decided saying Can't Be Arsed (CBA) was to much effort, so they began evolving the word into an easier, less energy costing phrase.