1. On a railway flatcar
   - piggyback, pig-a-back 
2. On the back or shoulder or astraddle on the hip
   - piggyback, pig-a-back

Encyclopedia: Pickaback

• Whitsun
• Whitsun Monday
• Whitsun Tuesday
• Whitsunday
• Whitsuntide
• Whittier
• whittle
• whittle away
• whittle down
• whittler
• Whitweek
• whity
• whiz
• whiz-kid
• whizbang
• whizbang shell
• whizz
• whizz along
• whizz-kid
• whizzbang
• who
• who'd
• who'll
• who's
• whoa