Slow-in-the-minds
First seen in Chris's school project A Week With Christian Chandler, "slow in the minds" and "slow minded" are CWC-ism that refers to mentally retarded, crazy, and/or generally stupid people. I.E. himself.
Usage
And finally, after a hard "odd" day, he rides home on a bus, but unfortunately, it had a few "slow-in-the-minds" on it.
These busses are full of nutty "slow-in-the-minds."
Apparently Chris uses this term to refer to mentally retarded or mentally ill kids who ride the Short Bus home, but not all "slow-in-the-minds" ride the special bus, so the term might also refer to the mentally retarded, the simply dumb, and perhaps bullies. One might surmise that it refers to anybody Chris thinks is dumber than him.
While we've only seen it once, "slow-in-the-minds" hits a fine trifecta of points: One, it shows Chris's arrogance, seeing as how it applies to so many classes of people, all of whom he considers "slower" than him; two, it shows Chris's lip-service attention to fitting in to society, since it's a piss-poor euphemism on its own and even worse when used in a school project; and third, it had a delicious irony in Chris decrying students who are "slow in the mind" even though Chris himself is of dubious mental stability.