The Fat Spy is a 1966 Z movie that attempts to parody teenage beach party films. It was filmed at Cape Coral, Florida. It is featured in the 2004 documentary The 50 Worst Movies Ever Made. Briefly released to theaters in 1966, it was rarely seen until the 1990s, when it was released to the public domain. Since then it has been widely released on DVD and VHS in various editions sold mainly at dollar stores.
Source: Wikipedia