A few tidbits about the band's name:
43 is number of the bus that frequents Kotež, the part of the city of Belgrade where the band members either live or like to hang out. The suffix "zla" means evils in Serbian. When you read it in Serbian it sounds like chetres-tree-zlah. It has a hidden meaning since the ree-zlah part (ризла/rizla in Serbian) means smoking paper, after well-known RizLa+ cigarette paper manufacturer and vendor.

Read more about 43zla on Last.fm.