Akin to photogenic, but pertaining to television. It's a quality - tone of voice, delivery, good looks, attractive body language - that endears you to the viewer. You can be a wife-beater or a tax-cheat, a liar or someone with the IQ of a small farm animal, but if you come across well on TV, none of that matters. News readers, spin doctors, politicians, and spokesmodels live and die by this.