besno

1. angrily; furiously
   Besno je zalupio vrata za sobom. — He slammed the door behind him furiously.
   Pogledala me je besno i nije ništa rekla. — She gave me an angry look and said nothing.
2. (of speed, force) wildly; at breakneck speed
   Kola su besno jurila kroz grad. — The car was tearing through the city at breakneck speed.
3. slang dated awesome; great
   Sinoć je na žurci bilo besno! — The party last night was awesome!

The slang sense 'great' is 1990s youth slang and sounds dated today; the usual words now are ekstra, super, strava.