It is quite obvious that he did not have any idea regarding what he was talking about(well he rarely has !), but I guess this will go down in history as one of the most prolific philisophical quotes ever made
by a dumb politician.
What Dubya intended to convey will always remain a mystery like his political intellect or administrative prowess.But taken as an independent quote, the interpretations this quote has received hints that the butterfly effect of this will be tremendous.
I have attached the video for your reference :