it means "you must be kidding me". "gotta" is used in written English to represent the words "got to" when they are pronounced informally, with the meaning "have to" or "must". If you are "kidding", you are saying something that is not really true, as a joke. (INFORMAL)

'you gotta be kidding me!' is correct yet informal english sentence / expression. it expresses disbelief, annoyance, dismay, upset and even a surprise - but not necessarily anger. other expression that might equal 'you gotta be kidding me' are: "is that / are you for real?" "this can't be happening!" "stop fooling me around." :)

If you regard "u" as a correct word, then the whole sentence is perfectly correct. Thought you knew what it meant a long while before, I presume it's probably in the Top 20 most frequently used American expressions like oh my God, f**k you, how are you doing, what's going on and so forth. You gotta be kidding me is short for you have got to be kidding me. Only if you already know what kid means as a verb, sir.

The correct expression is "you have got to be kidding me". It simply means that you must surely be joking with me. The alternative "you gotta be kidding me" is grammatically incorrect on two counts: 1. because the auxiliary verb "have" is missing; and 2. because "gotta" is informal spoken English only. Many Americans do use this expression in this way though, without the "have", it seems.

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