If you read my Gyaru terms & vocab blog that I posted a few months ago, then you may remember a term called Ogyaru, or Ogal. If not, no worries! I'll define the term again:
Ogyaru/ogal (汚ギャル): Literally means "dirty girl"; a gal who is unhygienic
It's clearly not the nicest term, but I still think its an important term for gals to learn. However, nowadays, it's practically a dead term. I know a simple Google search is often not enough when searching for Gyaru information in the best of circumstances, but I think the sheer lack of information on Ogyaru really goes to show how archaic this really is. So, despite this setback, I'll do my best to explain a bit more about Ogyaru!

