Old Slabsides Share definition Flag The affectionate nickname given to the 1911 pistol, owing to the slab-type grip panels. That fucking banger keeps it up, he's gonna get a lecture form old slabsides. Old Slabsides by ghost3x7 April 20, 2009 0 0 Get merch Get the Old Slabsides mug. Buy Now — $32.95 See more merch