What does "Do not judge" mean?

                                                                    

 The Bible tells us not to judge.

First of all, the definition of the word  Judgement: 

Faculty of the mind that allows to judge

shows us that it is not enough to say "do not judge" as if it were a slogan.

On the contrary, life depends on our ability to judge.

Which is enforced by the synonyms of the word: 

                                     Discernment, Common Sense, Evaluation, Consideration



The command of the Bible not to judge others does not mean that all actions are equally moral or that the truth is relative. The Bible clearly teaches that truth is objective, eternal, and inseparable from the character of God. Anything that contradicts the truth is a lie - but, of course, to call something a "lie" is to make a judgment. To call adultery or murder a sin is also a judgment, but it is also to agree with God. When Jesus said not to judge others, he did not mean that no one can identify sin as it is, based on the definition of God's sin.

Neither does it mean that we can not speak when we see a danger regarding a situation. 
It is our duty, it is irresponsible not to do so.

The meaning of this commandment is rather not to condemn anyone 
(especially when it is based on rumors), make scapegoats, blame, accuse without looking for the truth.