I'm BE's vintage give or take a few years. As a teenager in Perth there were a number of social identity groups that kids fit into. The two most common were surfs and bogs/ bogans and these two groups were the ones most diametrically opposed. Other groups were skins, punks and mods.
Bogs wore black ripple sole desert boots, tight black jeans, ac/dc t- shirts, fkanelette shirts, ear rings, tatts, ciggies tucked into the shoulder of their t-shirts, footy shorts to swim in etc.
Gosnells , Thornlie, Huntingdale etc was bogan central.
Not that it matters but maybe BE was a try hard bogan so kids called him boggsy. Or maybe he was a hard core bogan and picked it up that way.
Bogs did actually identify themselves as bogs too. It wasn't like only everyone else called them that. The whole thing was an image of perceived toughness and antisocialism.