fabler
Someone who thinks they can tell a good lie, but their stories are so bad they make a toddler's bedtime story look like a masterpiece.
He told me he was a professional basketball player. When I asked him to show me a layup, he missed the ball and it hit the ceiling.
She said she had a degree from Harvard. When I checked, it turned out she had a degree from a local pizza place.
He claimed he could speak five languages. When I asked him to say 'hello' in Spanish, he said 'hello' in English and looked confused.