Sped sled 

The small bus used to transport mentally and physically handicapped children to school. See also sped speeder, short bus, tart cart.

I knew Cody's brother was retarded when I saw him getting out of the sped sled.

Sped sled by Dorothy June 8, 2005

Sped sled 

The sped sled is the bus that mentality challenged children ride aka the short bus

Yo look at the retards riding the sped sled

Sped sled by Bumlordio March 7, 2020