Dead Alive (aka Brain Dead) Has to be one of the Head Dogs when it comes to mindless gore.
But Gorey-Over The Top-Comedies? Try "Story Of Riki-Oh (Or Ricki)", that is a HILARIOUSLY over the top movie that's easily in my top ten favourite films.
Here's part one (I can't post links yet, so just copy this at the end of the Youtube homepage:
The whole film can be found on youtube
If i can think of anymore, ill let you know buddy