One who lacks the intelligence of the "normal" sector of the human population; even so cannot handle the most mundane of tasks due to the lack of common sense and intelligence.
A laxative. Commonly used as pranks to make the person have to use the bathroom frequently. Over dosage can cause rectal bleeding. Can come in a chocolate form (like hersheys).
God he should be bleedingoutta his ass because of all the ex-lax you gave him.