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1.
Someone who stays predominantly on the top of buildings on popular FPS (First person shooter) games such as call of duty. These are often in covered places offering the 'Roof Head' an easy shot for unsuspecting non roof head.
'Watch out for those Roof Heads'

'Oh no a Roof Head got me'

'Clubber was killed by a roof head, RIP Clubber'
by SamJJH June 16, 2011