Slip It In is the fourth studio album by the American hardcore punk band Black Flag, released in 1984 on SST Records.Slip It In is an extension of the sound Black Flag utilized on its second album My War: heavy, cathartic, intense, dense and progressive. At this point, Black Flag was considered by many to be one of the leading bands of the American punk scene. The album pursued the newer, lengthier song arrangements that Black Flag would develop until its demise.