Hoodini is a running joke from Vanoss. It all started in GTA V when Vanoss and group glitch into a comedy club. When it's Vanoss' turn to tell jokes, the first joke he tells is, "Alright, what do you call a magic owl? Hoo-dini." They group laughs and Delirious happily says, "I get it, I get." and Wildcat comments, "'Cause owls go 'hoo'." They then proceeded to overuse the joke.
Hoodini's most often used appearance is a black tailcoat with a white blow tie and a black top hat.
GTA 5 Online Funny Moments - Comedy Club Fun! (Hoodini)
The first video of Vanoss' that Hoodini appears in.