When an individual lies or grossly exaggerates so often that it becomes difficult to determine whether what they're saying is true, a joke, or utterly false.
Originally coined by the YouTuber hbomberguy in his video "ROBLOX_OOF.mp3" while discussing the alleged lies of American video game music composer Tommy Tallarico.
"Jonathon's lies have been so profuse that his claim to have met the President with a picture of him posing Infront of a wax statue has crossed the Tallarico Event Horizon."