Not safe for prime-time. Said of television programmes with too much (or too-explicit or too-gratuitous or too-unconventional) sex (or violence or horrors or drug-using or swearing or what have you) to be broadcast before the watershed.
—"What?! What in blazes were they thinking, programming "Hotel Rwanda" at that godless hour?"
—"Yeah. Idiots. Although that scene with the car on the bumpy road is pretty gruesome. They probably thought it was NSFPT."
—"Not safe for prime-time."