When someone takes a simple statement and over-analyzes it.
Person 1: Wow you look great today
Person 2: So I didn't look great yesterday?
Person 1: Chill... It ain't that deep
by Stewy100 February 1, 2017
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A cheap copout response one uses whenever their opposition is even remotely serious about something or when they make a good argument against you.
Example 1:

Person A: Why hasn't anyone invented a rocket skateboard yet? It would be so cool!
Person B: *Makes a solid argument as to why that wouldn't work and is a stupid idea*
Person A: Bro it ain't that deep, no need to be so serious over it. Chill.

Example 2:

Person A: I love gardening! Plants are so beautiful, and their biology is so fascinating. Seeing a beautiful, blooming garden makes me cry tears of joy!
Person B: It's just a stupid plant dude, relax. It ain't that deep.
by Dumblenutz January 31, 2023
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A gesture to someone's pocket, usually a way to make a quick buck out of a stupid friend.
Steve:Yo Pockets Ain't Deep Cuz.
Steve:You owe me some money!
Steve:Can I have a dollar?
by Famous Girliesz March 9, 2010
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