jokeass is a term used to describe someone who makes an incredible fuck up while trying to show off.
Bob: "Dude... watch how hard I can throw this Wii bowling ball"
*controller flies loose smashing through flat screen*
Eric: "You fucking jokeass, you owe me a new tv"
*controller flies loose smashing through flat screen*
Eric: "You fucking jokeass, you owe me a new tv"
by slanginbeans February 3, 2010