munga junga Share definition Flag when a manboob is pulled and snapped back into place it occasionally bounces up and down a total of 2 or more times. much like the milkshake joke GUY1-"hey look over there" Guy2-*looks GUY1- pulls back boob and lets go "munga junga" munga junga by jay-ay-em February 6, 2008 Get the munga junga mug.