What is your favorite expression?

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If you happen to trip off something or suddenly surprised, what would be your response to your shock? What would be the words that will suddenly come out from your mouth? And how will you say it? My favorite expressions are which I commonly used... "shocking", "omg", "wtf (sometimes if I'm totally pissed off)", I made up this word "bustamalak" which doesn't have any meaning, I just made it up and "snap". These are my favorite expressions. But what about yours? What is your form of reaction? Share it.