people shout allah akbar when they Self Delete bomb or whatever
people also shout allah akbar when they find out they got accepted into a good college. or maybe they find out that they lost their wallet. it has several meanings give the context, but 'god is great' is the literal and not accurate translation of it.
the best comparison to english is "god protect me", but it literally has a hundred different uses that are not terrorist or killing related, such as "thank you god","god is the greatest", "god damn it", "im sorry god" etc etc