Today's fact: I never break the Third Commandment (Second, if you're Catholic or Lutheran).
You shall not misuse the name of the Lord your God, for the Lord will not hold anyone guiltless who misuses his name. [Deut 5:11]
The only exceptions in all my years are a very few isolated incidents in which I was quoting someone and couldn't think of a better way to rephrase. Since this is somewhat vague, my own interpretation is to not use God's name unless you're actually talking about God. Thus, using that word as an exclamation, or along with a request for Him to damn someone, is right out. Seems reasonable and respectful enough.