Spazztard
A cross between the words "spazz" and "retard". The individual who happens to be dubbed this, usually have the traits of both of these. They either are very spastic in their movements and are mentally retarded or, they act like this in a highly convincing manner.
"Stop being such a spazztard, you're making a fool of yourself."
Spazztard
A Spazztard is a person who presents as slow mentally or awkward but is not.
After stumbling out of math class and saying those weird things to that girl he felt like a Spazztard