slimjuan Share definition Flag A clever algorithm used in hacking. A programming analogue to what a slimjim does with a car door. He didn't have to brute-force his way in, he used a slimjuan. slimjuan by Haxor Maximus April 21, 2018 0 0 Get merch Get the slimjuan mug. Buy Now — $32.95 See more merch