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A turn of phrase generally used by people who feel the need to comment on something and yet at the same time have absolutely NO idea what they just read but would like to come off as intelligent.
Poster: “We felt we were doomed to die and say how powerless we were to help ourselves; but that was good, for then we put everything into the hands of God, who alone could save us.” II Corinthians 1:9

Comment from someone: That's deep
by Electric Nerd February 09, 2010
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Something you say when someone says something off the wall or so crazy you realize there must be some deep seeded issues within their life they need to work out.
Crazy person: "Yeah, I know I'm Asian, but I can't stand chinks!"

You: "Wow...That's deep..."
by Philawesompher December 02, 2011
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When bae says something and he/she hits the nail on the head.
bae: Every Charizard once was a Charmander.

me: That's deep.
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