Definition of whizzes:
(n) :
(informal) Someone who is remarkably skilled at something.
(v) :
To rush or move swiftly with such a sound.
(v) :
To make a whirring or hissing sound, similar to that of an object speeding through the air.
(n) :
A whirring or hissing sound (as above).
(v) :
To throw or spin rapidly.
(v) :
(vulgar, slang) To urinate.