My girlfriend is retarded

prolog

You idiot...

Idiot is a derogatory term for a child with low intelligence.

Due to some accident

The body is growing...

Knowledge... intelligence... is something that remains the same as your age when you have an accident...

Living at the age you were when you had the accident...

for example

The accident happened when I was 7 years old... Then my body started growing little by little.

Knowledge and intelligence are the knowledge of a 7-year-old and the intelligence of a 7-year-old.

My girlfriend is exactly that type.

Idiot...

My girlfriend is retarded, starting now..