The phrase "faecal matter" refers to solid waste that comes out of your body through the rectum. It's another way to say "feces" or "poop". Full definition
Members of the Ga Dangme Youth have threatened to stage a demonstration over recent discharges of faecal matter into the Chemu Lagoon. (ghtvonline.com)
Some promise to extract the mysteries of our microbiomes from faecal matter in the post. (newscientist.com)
The week started with Google updating translate for Android, with 14 different languages, news reached One Mobile Ring that one in six mobile phones in Britain is contaminated with faecal matter. (onemobilering.com)