As
P_I mentions, "Bog" is the
Russian for "
God". Besides its use in
A Clockwork Orange,
English-speaking
science fiction fans may recall it from
Heinlein's The Moon is a Harsh Mistress, wherein it was
Manuel Garcia O'Kelly Davis's favorite
swear word.
In Russian, "Bog" is not pronounced like the English word "bog". The closest English pronounciation would be somewhere between boke and bock.
Compare also "Bojemoi".