zeznuti

1. colloq. (+ acc.) to screw over; to trick
   Majstor nas je zeznuo i uzeo duplo više para. — The repairman screwed us over and charged twice as much.
   Nemoj da me zezneš, računam na tebe. — Don't let me down, I'm counting on you.
2. colloq. to mess up; to botch
   Zeznuo sam test iz matematike. — I messed up the math test.
   Kiša nam je zeznula ceo izlet. — The rain ruined our whole trip.
3. colloq. (zeznuti se) to screw up; to slip up
   Zeznuo sam se, sastanak je bio juče. — I screwed up, the meeting was yesterday.

The imperfective zezati usually means "to tease, to kid".