From [link|http://www.paulgraham.com/avg.html|Beating The Averages], your complaints about "wierd languages" reminded me of it very strongly.
As for defending the right of dynamically typed languages to call themselves OO, well that is a silly requirement. The phrase "object oriented" was coined (AFAIK) by Alan Kay, and he went on to design the first intentionally object-oriented language, which he called Smalltalk. I say intentionally, because he found a lot of the ideas in an earlier language known as Simula.
Any decent discussion of the history of OO acknowledges this, and goes on to point out that other OO languages such as C++ then borrowed heavily from Smalltalk.
Seriously, can you find me any discussion anywhere where someone with any semblance of a clue refers to Smalltalk as not being really OO? Can you find any reasonable discussions of OO that list strong-typing as needed for the concept? Or are you just trying to define convenient pre-conditions for discussion with no concern for reality?
Cheers,
Ben