A commercial that gives you information about the thing they are advertising (also known as my homework assignment due this Thursday). Only nerds are good at these btw.
To fail amazingly badly at a basic or simple task. Infomercials use this kind of exaggerated, highly unlikely failure to demonstrate the nonexistent or dubious "problem" the product in question supposedly solves (i.e. trying to crack an egg into a bowl and instead splattering egg and crushed shell pieces all over everything within three feet, hammering a nail into drywall and sending the hammer right through the wall, eating a sandwich and having its entire contents fall directly into your lap, etc.).
A seemingly endless dump which stops and starts repeatedly, usually during the wiping process. This leaves the user thinking there done... "But WAIT, there's MORE!".
Hands that can't do anything correctly. Infomercial Hands can't strain a pot of pasta or screw in a lightbulb or push buttons on a phone, so they require the purchase of a new fangled item that will come to the rescue.
Scott: What's with that guy? Why can't he tie his shoes?
Peter: He's suffering from Infomercial Hands. He clearly needs ShoeTie™.
Endangered sub-species of homo sapiens, who due to ineptitude in any given task poses a health hazard to themselves and their surroundings. Often suffers from mal-nutrition, as simple tasks as chopping a vegetable with a knife, results in hospitalization. Also prone to different infections and diseases, as handling used rags, mops and cleaning equipment that's not highly specialized (as promoted in an infomercial), will despite ease of use and common knowledge, be used not only wrongly - but with some sort of health risk. Some cases of hoarding has been observed, but there is yet no documentation of Infomercial Sapiens" being hoarders in general.
UNESCO has put Infomercial Sapiens on the endangered species list, as they will either kill themselves, or die out when streaming of media will remove infomercials from TV-screens.