verb-intransitive. To make a whirring or hissing sound, as of an object speeding through air.verb-intransitive. To move swiftly with or as if with such a sound; rush: whizzed past on a ten-speed bike; as the days whizzed by. v. To throw or spin rapidly: The pitcher whizzed the ball to first. n. A whirring or hissing sound, as of an object speeding through air.n. A rapid passage or journey.n. Informal One who has remarkable skill: a whiz at all sorts of games. idiom. take a whiz Vulgar Slang To urinate.