Cock grunge Share definition Flag The accumulation of detritus that builds up on an uncircumcised penis, especially following sexual activity of the anal variety. Daniel Radcliffe suffers from chronic cock grunge, according to Rupert Grint. Cock grunge by T. J. Watson January 11, 2009 0 0 Get merch Get the Cock grunge mug. Buy Now — $32.95 See more merch