šoljica

1. small cup; coffee cup
   Oprala sam šoljice posle gostiju. — I washed the cups after the guests left.
2. (as an amount of drink) cup
   Svratite kod nas na šoljicu kafe. — Drop by for a cup of coffee.
   Ujutru popijem dve šoljice čaja. — In the morning I drink two cups of tea.

Diminutive of šolja; šoljica kafe is the neutral, polite way to say “a cup of coffee”.