If I hear those words, it is the same as a Marine hearing the words
GRENADE! It means
HIT THE DECK! a bomb is about to go off!
I thought that while riding the subway today, if I heard someone loudly say "allah akbar!" in the subway car, I'd immediately hit the deck and try to stay under the blast shrapnel. Honestly, I think everyone should remember, "allah akbar" means
HIT THE DECK!, or like they used to say in the cold war films,
DUCK AND COVER! Remember it as a reflex, that reflex might save your life someday, no joke.
Unless you are on an airplane, then allah akbar means, beat the sh** out of the guy who said it until he is unconscious or dead.
And that was your public service announcement for today.

.