When they saw her coming they ran to meet her, and Curly carried her into the house "pig-a-back.".    From Wordnik.com.  [Boy Blue and His Friends] Reference

Whether because Frodo was so worn by his long pains, wound of knife, and venomous sting, and sorrow, fear, and homeless wandering, or because some gift of final strength was given to him, Sam lifted Frodo with no more difficulty than if he were carrying a hobbit-child pig-a-back in some romp on the lawns or hayfields of the Shire.    From Wordnik.com.  [The Lord of the Rings]

They rode pig-a-back races and sang all the songs.    From Wordnik.com.  [Adventures and Letters of Richard Harding Davis] Reference

"Such a game as this I never learned in Amsterdam or New Amstel," thought Nanking, laughing good-naturedly; "I guess I will cut it short by riding one of their boys pig-a-back.".    From Wordnik.com.  [Tales of the Chesapeake] Reference

He uttered a faint "Ah!" and would have fallen but for the boy's ready arm; and the next minute he was being borne up the steps, pig-a-back after all, though he had scouted the offer before.    From Wordnik.com.  [The Black Tor A Tale of the Reign of James the First] Reference

Now, you have a bit to eat, and then go to sleep, and when you wake up let's see if I can't manage to get you on one of those flat bits o 'slaty stone, and then I'll get a strap to it, and pull you down the slope -- you'll quite slide like -- and when we're off the snow I'll pig-a-back you to the first wood, and we'll hide there, and I'll keep helping you on a bit till we get to this here Jack-and-Jill Valley.    From Wordnik.com.  [Fix Bay'nets The Regiment in the Hills] Reference

"Wasn't impossible to have given a fellow a pig-a-back.    From Wordnik.com.  [To The West] Reference

I'll carry him down what you English call pig-a-back, if he's worn out. ".    From Wordnik.com.  [The Crystal Hunters A Boy's Adventures in the Higher Alps] Reference

Hang on to my hand; or, look here, Phil, what do you say to a pig-a-back? ".    From Wordnik.com.  [A Young Hero] Reference

And I'll carry Felicia pig-a-back. ".    From Wordnik.com.  [The Forbidden Trail] Reference

"When a child did ye ever play pig-a-back?.    From Wordnik.com.  [Ethel Hollister's Second Summer as a Campfire Girl] Reference