mucker Share definition Flag One who is high on meth and steals anything, insignificant or not, just for the sake of stealing. "The muckers broke into Johns house after he got busted" "That bitch mucked my jeans and my dope!" mucker by Gkelly September 25, 2005 0 0 Get merch Get the mucker mug. Buy Now — $32.95 See more merch