The phrase "oh my gosh" is an expression of surprise, shock, or astonishment. It is the phrase "oh my God," backwards and can be used in a variety of situations, such as when someone is impressed, amazed, or incredulous. The phrase is often used to convey a strong emotional response without using language that may be considered offensive or inappropriate in certain settings. It's a common and informal expression that is widely used in everyday conversation.
“You have to take five shots!” *replies with* “Oh gumbo!”