What is meant by the phrase tongue in cheek on global affairs

Idiom tongue-in-cheek refers to a humorous or sarcastic statement expressed in a mock serious manner.

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Teachers shape and cultivate the minds of history, present, and future. Our greatest minds and intellects have learned both their knowledge and morality from their teachers. Teachers are the backbone of many generations for they molded us out of mere clay and brought out our inner talents, thoughts, and skills. They are the enhancers of our world which is entirely different from farmers. Both are very contradictory wherein farmers are a mere teaching of agricultural activities and past verified or unverified information. Teachers on the other hand hold an upstage wherein they are fully knowledgeable and know what is and what’s not applicable in the various lessons (both life and practical) through them.