Sure...
It's called the "talking out of your ass" fallacy, where you say whatever you want to back up your argument of the moment, ignoring the fact that your current argument contradicts your previous one and hoping no one will notice.
Orwell had a better name for it - Doublespeak or doublethink, which he defined as a person holding two opposing ideas in his or her mind at the same time, fully believing in both ideas.