When somebody says something about a certain group of people that a lot of people think is true but really it isnt.
Sometimes they are true though, but on a rare occasion.
Here are some examples.
All blacks like rap.
All white people from the south like country.
All blacks are gangsters and live in the ghetto.
All blondes are stupid.
All people with A.D.D or A.D.H.D are idiots who always get bad grades.
Everybody from the south is a redneck.
All Americans are money crazed.
All Canadians say "eh" all the time.
All emos cut and hate life (true)
These are all stereotype's.