jackass of all trades Share definition Flag someone who is good at what he attempts but is conceited and arrogant about his own skills Yea, Nathan is a jackass of all trades. He passed both his tests, and rubbed it in my face. jackass of all trades by Faggle October 26, 2007 0 0 Get merch Get the jackass of all trades mug. Buy Now — $32.95 See more merch