lupiti

1. to hit; to bang
   Ljutito je lupio šakom o sto. — He angrily banged his fist on the table.
   Lupila sam glavu o ormarić. — I hit my head on the cupboard.
2. (+ instr., of a door) to slam
   Izašao je iz sobe i lupio vratima. — He left the room and slammed the door.
3. colloq. (of something silly) to blurt out
   Opet je lupio neku glupost na sastanku. — He blurted out something stupid at the meeting again.
4. colloq. (of a car) to crash; to smash up
   Lupio je tatin auto prve nedelje. — He crashed his dad's car in the first week.

The imperfective is lupati; "to slam the door" is lupiti vratima (instrumental).