An Oliver Dunbar is a person who is OD. Usually someone of a large stature who is quite burly. He also must at least drink one 40 a day and smoke at least 1 blunt with a grape dutch every 12 hours.
" Hey look at that guy smokin a blunt. Woah he's drinking a 40 too! Wait, theres like 5 empty 40's next to him wtf?
" Hes just an Oliver Dunbar, dont worry."