The Happy Diwali Jethalal meme originates from the Indian comedy TV show Taarak Mehta Ka Ooltah Chashmah. In episode 51, Jethalal Gada (the character played by Dilip Joshi) tell his father Champaklal Jayantilal Gada (the character played by Amit Bhatt) about the speciality of a new type of firecrackers that costs ₹1000 each.
Jethalal is a foodie who enjoys eating meals provided by his wife Daya (who annoys him the most). Champaklal, Jethalal’s father, occasionally berates him for being too tough with his sons Tapu and Daya. Gada Electronics is owned by him. Champaklal refers to Jethalal as Jethiya, Daya refers to it as Tapu ke Papa, and Babita refers to it as Jethaji.
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Since the episode aired on television, the meme has been actively shared every year on the eve of Diwali, an Indian festival of lights. The popular use of the Happy Diwali Jethalal meme is to wish someone.