Good old Doonesbury (http://www.cnn.com/2005/SHOWBIZ/books/07/27/doonesbury.language.ap/index.html). The funny part is, that's what Bush calls him. You wouldn't really expect Trudeau to leave that alone, would you?

I that is what I'll name my firstborn child.

How do we REALLY know that he calls his staff those stupid nicknames?

I think it's equally likely that some blogger just makes it up.