A fork of Rural Dictionary
Basically an updated version of "shooting yourself in the foot" or "fucking yourself over." Taken from the miserable campaign of Jung-Suk Ryu for city Counsillor in Edmonton, AB. Also: jungsuker: the individual junsuking oneself. jungsukery: the act of jungsuking.
"When Jimmy puked at the bar, he totally jungsuked his chances with that that chick."