Adj. This expression is a play on the similarity between the word "thorough", and "Thoreau", the last name of famed author Henry David Thoreau. "Henry David" as a phrase can be used to replace the word "thorough" in any common sentence.
For instance, say you are in the middle of a board room discussion with a bunch of corporate executives. You could chime in and say "I've done a very Henry David analysis of these reports, and things are looking good."

By adding "ly", this can also be made into an adverb. "I Henry Davidly enjoyed our evening. Let's do this again!"
by big_earl April 27, 2018
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David Henrie is an American actor who was born in California. He is noted for playing Ted Mosby's future son Luke Mosby on How I Met Your Mother, Justin Russo in Wizards of Waverly Place, Larry on That's So Raven, London Busbee in Little Boy, and Rudy Ising in Walt Before Mickey.
David Henrie is well known for playing the role of Justin Russo on Wizards of Waverly Place, alongside his co-star Selena Gomez, who played his troublesome sister, Alex Russo.
by The Oddball July 20, 2016
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A tall smart, funny and handsome guy blessed in more ways than one 😉 If you come across a David Henry hold on tight cause he’s a rare soul to come by
*Guy walks in room*

Girl 1: Dammnnnn who’s that? 👀
Girl 2: I thinks it’s David Henry 😍
by November 23, 2021
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