aluminium slag
A woman who gives sexual favors in exchange for bags of recyclables, most commonly aluminium cans. The term originated near the scrapyards in WW2, when women would use these favors to encourage others to pitch-in on the War effort.
"I was taking my cans down to scrap for beer money, when i ran into an Aluminium Slag. Ten minutes later she had my cans and i needed a wet-nap!