Autism, but with an intellectual disability. A person with Low Functioning Autism will not be able to live independently, unlike people with High Functioning Autism or Asperger's Syndrome.

People with Low Functioning Autism often have little to no speech. They may make random noises as oppose to words. (LFA is the abbreviation for Low Functioning Autism.)
I feel bad for him, he has Low Functioning Autism.
by Faggot Disorder May 12, 2020
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