(Exodus 20:7) "You shall not take the name of the LORD your God in vain, for the LORD will not leave him unpunished who takes His name in vain

http://www.sermonnotebook.org/old%20testament/exodus_20_7.htm

Please see below for the highlights which are an examples given from attached link.

This verse tells us that it is wrong to use God’s Name in vain. This word means, "empty, idle, insincerely, phony, frivolous, lacking in reality and truth." When we treat the Name of God as another by-word, it is nothing short of blasphemy! Sadly, we hear His Name degraded far more often that we hear it being exalted! There are 2 primary ways in which we violate the Blessed Name of God.

A. When We Use It As A Curse – How many times have we heard, or said, "Oh God!"; "Oh my God!"; "Jesus!"; Oh Jesus!"; "Oh Christ!"; "Jesus Christ!"; "God Almighty!"; or any of a thousand others just like those? Even Christians are guilty of saying things like, "Oh Lord!"; "My God!"; "Good God!" We’ve all done, but it is degrading to the Lord’s Name to throw it around so casually. Often, we are guilty of using slang expressions that we feel to be harmless, but which are actually derivatives from some form of God’s Name. Some are: "Gosh, golly, gee, gee whiz, cripes, criminy, jeeze." Others are just a play on the mother of all curse words, "God Damn It." They are: "Dog gone it; Gosh darn it; dang nb it; dad blame it, etc." Often, men will attribute things to God which He had no part in by saying, "By God!" Others will seek to invoke His Name by saying "God Almighty!" No matter how you say it or how you slice it up, when we use the Lord’s Name in a vain way, we are guilty of violating the Holiest of all Names! (Ill. I haven’t even dealt with the little slang words we use when angry! You know what you say!"

Dr. L. Nelson Bell warns that a person who freely uses "hell, " "damn," and "devil" in his conversation may well be reminding himself of his destination, his condition, and his master.