When someone says something you agree with.
I understand, I get you, or I know what you mean. Used as a term of understanding.
Guy 1: Bro I just got a new car with rims.
Guy 2: I feel that.
or
Guy 1: I knew I should've gotten the boxer instead of the retriever
Guy 2: with the boxer you'd probably pull more so I feel that bro
The typical bullshit, don't give a fuck, patronizing response from an "authority" when you tell them what you really think.
Worker: "This job isn't worth the gas it takes me to drive my car in every morning, the shit I put up with should never have to be tolerated by any human being. This job's for the fuckin' birds."
What you say when somebody openly disagrees with you or contradicts your statement, but you really could give less of a shit, and don't want to start an argument, so you dismiss their words by boldly stating your sarcastic happiness about his opinion.
Jake: You shouldn't have robbed that bank.
Me: I'm gladyou feel that way