Mexican Slimjim Share definition Flag A ghetto device used to break into cars illegally. Usually a metal hanger or brick. Shoot, I locked my keys in my car. I need to go in my house and get a Mexican Slimjim to get them out. Mexican Slimjim by The_Sentinal March 10, 2009 0 0 Get merch Get the Mexican Slimjim mug. Buy Now — $32.95 See more merch