prokrijumčariti

1. to smuggle
   Pokušali su da prokrijumčare cigarete preko granice. — They tried to smuggle cigarettes across the border.
2. to sneak in; to slip in
   Prokrijumčarili smo grickalice u bioskop. — We sneaked snacks into the cinema.
   Autor je u roman prokrijumčario političku poruku. — The author slipped a political message into the novel.

In everyday speech prošvercovati is more common.