u got beef? Share definition Flag A phrase asking if someone has a problem with you, what you're doing or what you like, usually said as a threat. Some guy: "System of a down sucks!" Some guy who likes system of a down: "u got beef?" u got beef? by Janerz July 17, 2006 0 0 Get merch Get the u got beef? mug. Buy Now — $32.95 See more merch