"Tank Girl" was, I suppose, meant to be the "Buckaroo Banzai" of the 90's and was marketed as such. The comparison is, admittedly, appropriate; both movies have so many things going on in any given frame of film that, as impossible as the story is to sort out, it certainly isn't boring.
"Tank Girl" is a fun enough ride if you turn your brain off before the movie starts. Otherwise you'll end up with a skull-cracking headache like me.