jackanory - Someone who tells a story or a lie and thinks it's the best

Someone who tells a story or a lie and thinks it's the best thing since sliced bread.

My little sister said, 'Jackanory!' when she told me my dog was a prince. I told her, 'You're a f***ing idiot.'

At school, my friend said, 'Jackanory!' when he told the class he could fly. I laughed so hard, I got a stomachache.

My dad said, 'Jackanory!' when he told me he was a super spy. I said, 'You’re a f***ing fraud.'