What makes 'cos' unique?

Note: the category and title are both clues and you may need to use some twisted logic as the answer is not straightforward

You say that both the title and the category are clues.

The title "not so triggy" makes me think that the 'cos' in question is not related to trigonometry.
I suppose that 'cos' in this case refers to the slang abbreviation of 'because'. It's unique because there's no other word that transforms the 'au' into an 'o'.

I fear that's not twisted enough, is it?

Posted by abc on 2003-09-19 10:51:50