Just realised why this expression makes me want to roll my eyes. There's an old and common expression, "I feel for you". It's one of those saccharin, treacly expressions that just sound fake and are best relegated to really bad B movies. If someone actually said to me "I feel for you", I think that I'd burst out laughing. The expression we're talking about is the same one, and probably came from it, except it leaves out the word "for". This means that it can be used to express not just sympathy, but "connectedness". Like some kind of emotional telepathy, maybe courtesy the Starship Enterprise. This kind of thing is the linguistic stock and trade of people like the Kardashians. Can Dr. Phil be far behind? Sorry, but like the original, it's treacly rubbish :)

I understand; I agree you (depending on the conversation). It is very informal.

I don't think that a native English speaker would say "I feel you", except maybe an insufferable Brooklyn hipster. Personally, thank God, I've never heard anyone say it. P.S. I take it back. Apparently it's in some internet urban dictionary meaning "I understand you" or "I empathise with you". Sounds like it's American slang.

agree, understand, empathize

I am finding some comments on this posting very disturbing! The purpose of these platforms is to provide answers to questions from people who do not speak the language, know the slang, etc very well. It is a shame to see people who are not prepared to be supportive and provide constructive comments but more rude and unhelpful!! If nothing supportive can be provide DON'T SAY ANYTHING AT ALL!!