Noun

1. A period of exceptionally hot weather.

   We're havin a heat wave

   A tropical heat wave

   The temperatures rising, it isn't suprising

   She certainly can, can can!

   She started a heatwave

   By letting her seat wave,

   in such a way that the customers say

   that she certainly can, can-can! — Marilyn Monroe, "There's No Business Like Show Business"