A common phrase originating in the English translation of the Lord's Prayer, it's also used as shorthand for "until the kingdom of Heaven should come." When used in an expression like "I'm gonna blast you to kingdom come", it probably means that's how long it's going to take for the pieces to come back down.

Also, the name of a comic book limited series written by Mark Waid, lavishly painted by Alex Ross and published by DC Comics in 1998. The story is set in the not-too-distant future of the DC universe, where Superman has been in retirement for twenty years and the children and grandchildren of the Golden Age superhumans have led society into near-anarchy. This is widely recognized as one of the best comic stories published in the last decade.