Hide The Sausage Meaning

(idiomatic, slang, euphemistic) To have sex.

Example: 2004, Mlyn Hurn, Hunter's Legacy (Blood Dreams, Book Two) - page 29
  He pressed his rock hard cock against the soft flesh hidden by her cotton shorts. “But at night, I want to be all 'growed' up again so I can play hide the sausage in your bed!”
2011, Jeremy Clarkson, Round the Bend
  It's a bit like Dubai. Yes, there is a sea and sand, and providing you don't play hide the sausage with someone's else's wife, you will have a nice time.