A person who is dumb, someone who is schizophrenic, someone who are apart of the spectrum. Someone doing something stupid or something stereotypical someone on the spectrum would do.
"That girl Arena decided to arm wrestle great champion Muhammad, I swear she was sped in the head!" "That dude Elijah is schizophrenic, so people just started calling him sped in the head. Seriously, what has the world come to?" "Dave, shut your sped ass up."
A retarded family with many problems
Shit, the Sped Coley’s are here, Everyone RUN!!
Receiving head from a special needs
Bro I didn't know she was special needs and ended up getting sped-head