8-laner Share definition Flag The brown stains left after flushing a big shit down the toilet. Dude, I just droppped an 8-laner shit in your mom's toilet. Your Mom's toilet bowl looks like a brown 8 lane super highway . 8-laner by Chris Nubby August 6, 2007 0 0 Get merch Get the 8-laner mug. Buy Now — $32.95 See more merch