As a Noun:
1. Minced meat which has been shaped into a flat disc or round flat ball and which is fried. English = burger, patty, rissole.
2. A bread roll which contains minced meat that has been shaped into a flat disc and which may also contain lettuce, tomato, cheese and so on. English = hamburger.
3. A ball of snow. Children often throw them at each other. English = snowball.
As a Verb or Adjective:
1. To shape meat, snow, mud and so on into a ball using your hands.