Four giggling schoolgirls this morning one of them points to a boy walking past, she said look at his backpack what a swot. I looked at him and could see nothing to mark him out as a swot/geek and so I asked what they meant. They told me that only swots or geeks wear their backpacks high on their back, it'’s cool to wear it as low as possible. Anyone know anymore obscure social signals.?