When someone who is so mentally retarded they aren't allowed near the normal kids.
They can be seen running straight into doors and sexually harassing the class pet.
They will bite and scream so proceed with caution.
Billy is a Spedtard, I saw him jizz in the teacher's coffee and laughed when she drank it.
Speltard: someone who not only can't spell worth a shit but is also too stupid to look the word up in the dictionary and correct it. Also, a person who consistently misfiles things because they can't get it through their thick head that ABX comes before AXB.
I can't believe they let speltards graduate from university." Or, "Who are the fucking speltards that keep misfiling shit around here?