Definition of "slide off"

Soon as he could, he slid off to Jim's rooms to make sure he'd left nothing around that a journalist might pick on if a journalist were clever enough to make the connection, Ellis to Prideaux.

1974 June, John Le Carré, Tinker Tailor Soldier Spy, London: Hodder & Stoughton; republished in The Quest for Karla, London: Hodder & Stoughton, 1982, page 162

Susan and I slid off to an Indian restaurant in Shepherd's Bush, and I slid off on to the floor.

2003, David Nobbs, “The Nervous Nineties”, in I Didn't Get Where I Am Today: An Autobiography, London: Heinemann; republished London: Arrow Books, The Random House Group, 2004, page 444

As Simone and the crowd praised Drew I slid off to the back hurt, ashamed, and pissed off.

2010 December 16, Lamont Z. Brown, “Standing within His Shadow”, in Between the Gates of Heaven and Hell: My Crazy Crayola World, [Bloomington, Ind.]: Trafford Publishing, page 10

I slid off to follow her and I heard the scrape of a board on snow.

2013 January 8, Steven Gould, “Cent: ‘Was He Hitting On You?’”, in Impulse, New York, N.Y.: Tor Books

If you knew your girl was sliding off with the next dude you telling me you wouldn't negatively react?

2014 February 27, Robert A. Grant, Jr., “This Here Generation”, in Mind of a Writer, Bloomington, Ind.: AuthorHouse, page 103