Long head (or long 'ed) is a term usually used to describe someone (or something) that is long; however, it is more directly used in reference towards a person who is lazy/idle/unmotivated/annoying/self worshiping
'Im going to Download festival this year'
'Im not; too many long heads trying to out metal each other'
'Why are you late for work?'
'My car wouldn't start. It was being a long head'