Frustration-aggression hypothesis refers to the theory that all frustration leads to aggression, and all aggression comes from frustration.
It is used to explain prejudice and intergroup aggression.
Other definition:
Frustration/Aggression hypothesis is defined as early learning theory of aggression which holds that frustration triggers aggression and that all aggressive acts can be traced to frustrations; hypothesis that states that frustration always produces aggression and aggression is always the result of frustration.