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When a teen condescendingly assumes that they know more about a topic than the adults around them, usually their parents. The teen then explains the topic to the adult as if the adult is completely ignorant regardless of their experience or expertise. This is frequently accompanied by the extreme certainty that can only be maintained through inexperience.
Maya was teensplaining to me that intelligence is about 75% heritable.
"You'd know that if you weren't such an idiot, Dad!"

My daughter teensplained pop music to me, as if I hadn't lived through the 80s.
by ZippySanjay June 21, 2017
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