The part of the brain connected to the back of the throat that regulates the intensity of a gag reflex. Upon receiving sensory input from the brain, the gag-o-magnifier then calulates the gag factor - taking into account synergistic variables such as alcohol or drug over indulgence, excess pie intake, and outside influences such as a blast of shit.

Gag-o-magnifier is from the Ninja Turtles cartoon.

Better way to say nasty. Implies something with a high gag-o-magnifier quotient.

Also 'nastorious to the asorious' which is as bad as it gets.