Learn what "i'm smiling like a 5 years old" means, when people say it, and how to use it naturally in English.

It means the speaker is smiling in a very big, innocent, excited way.
From An Affair With My Boss, Episode 56
The speaker compares their smile to a childlike, very happy expression.
Use it to describe being very happy or excited in a playful way. The grammar is a little unnatural, so it is more useful as a learner example than a polished phrase.
Scenes unlock real expressions as you watch
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Reinforce with quick quizzes and repetition
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