"Damnation" (or, more commonly, "damn", or "god damn") is widely used as a moderate profanity, which originated as such from the concept of punishment by God . Until around the mid-20th century damn was a more offensive term than it is today, and was frequently represented as "D--n," "D---," or abbreviated to just "D."
Religious
In some forms of Western Christian belief, damnation to hell is the punishment of God for persons with unredeemed sin. Damnation can be a motivator for conversions to Christianity.One conception is of eternal suffering and denial of entrance to heaven, often described in the Bible as burning in fire. Another conception, derived from the scripture about Gehenna is simply that people will be discarded (burned), as being unworthy of preservation by God.In Eastern Christian traditions (Eastern Orthodoxy and Oriental Orthodoxy), as well as some Western traditions, it is seen as a state of separation from God, a state into which all humans are born but against whi
Source:
http://en.wikipedia.org/wiki/Damnable