In many ways this is the prototype to the cult classic Samurai Cop with Amir Shervan directing the legendary Robert Z'dar in a slice of 80s action cheese.
Killing American Style isn't as good as Samurai Cop though, it has the latter's violence, gratuitous nudity and bizarre characters though lacks a bit of charm. Its still well worth a watching if this kind of trash is your thing. If you are like me basically...
The plot is ridiculous (of course). Z'dar leads a gang of bumbling hoodlums which includes the very strange Lynch who literally is a man who thinks with his penis. Luckily for Z'dar and company the cops are equally as useless.
Unluckily for Z'dar he tangles with a long haired hero (hmm that sounds like another film) who is also a kickboxer...