An ATOMIC CLOCK is a device that is the same fucking thing as any type of timer that has ever existed. The same thing that is on a nuclear submarine is also on your wristwatch.
A reference to stupid and ignorant wannabe physicists who argue with people who actually know primary school science. 'atomci' is a mispelling of 'atomic' as was popularised by some idiots in science newsgroups.
They tried to say 'atomic clock god' to refer to the way some scientific theories are backed up by readings of atomic clocks.