There is no real known origin for this popular saying that one usually hears or says during picture taking time. Why the word 'cheese'? Generally when people say it their teeth show and their mouths go up in a natural smile. Perfect for the photographer trying to capture the subjects smiling. ( source )

This phrase came from a literal source. Some cheeses, like Limburger, are so smelly that even slicing the cheese will cause its odor to diffuse over a broader area.  In other cases, the rind masks the odor of a cheese, but cutting the rind will cause the cheese to release its natural odor. ( source ) Figuratively the phrase means farting because, as the source says so well, like cutting a smelly block cheese, a fart can suddenly cause a smelly odor to broadcast over a wide area.

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National Buttercrunch Day Toffee Butter Crunch Dark Chocolate Buttercrunch Peppermint Buttercrunch Penguin Awareness Day Show your awareness of penguins by dressing in all black and white for the day. Even better, wear a tuxedo so that every time someone asks you why you are wearing it, you can explain that it is for Penguin Awareness Day, furthering the awareness of penguins. Carry around a plush toy version of a penguin . Donate penguin stuffed animals to a children's charity. Send loved ones and colleagues penguin themed e-cards wishing them a happy Penguin Awareness Day. Visit your local zoo just to see the penguins. Rent or buy a documentary about penguins , and spend the evening watching it with friends. Chat about your love for penguins with everyone that you can throughout the day. Donate and encourage friends to donate to a marine sanctuary in support of penguins. Celebrate Penguin Awareness Day by making others aware of penguins. ( Source ) Outside of the box ide...