Hhhhhhh-iiiiiiiii or Recyclables?

Every once and while I peruse the streets near my house , just to get out and shoot. These photos are from a small recyclables receiving shop behind the market Throughout the day, you will a squeak, squeak followed by someone yelling, hhhhh-iiiiii or something to that effect. If you have recyclables, you can sometimes make some small pocket change or just get rid of plastic, metal - pretty much anything that isn't rotten food. Whenever I say it back to them, they just laugh. I must be pronouncing it wrong. Anyways, that's what it sounds like.

These photos are of some of the staff there. Most of them were drunk when I got there, so they were extra open to me taking their photos. Haha.