self-fulfilling prophecy 

When a false or true statement is said about someone enough times, it eventually becomes true.

If you call your girlfriend a bitch, she will become a self-fulfilling prophecy and act like a bitch.

self-fulfilling prophecy by icehot15 October 17, 2014

Self Fulfilling Prophecy 

Positive or negative expectations about circumstances, events, or people that may affect a persons behavior toward them in a manner that he or she (unknowingly) creates situations in which those expectations are fulfilled.

In other words, causing something to happen by believing it will come true

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Example 1:
An employer sees a new employee and automatically expects him to be disloyal. The employer then treats the employee in a way to elicit the very response he concluded.

Example 2:
Labeling someone a "criminal," and treating that person as such, may foster criminal behavior in the person who is subjected to the expectation, thus creating a self fulfilling prophecy

Self Fulfilling Prophecy by .PiCe.NuSSy. October 24, 2008