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

• vehemency
• vehement
• vehemently
• vehicle
• Vehicle Excise Duty
• vehicle traffic
• vehicle-borne transmission
• vehicular
• vehicular traffic
• veil
• veiled
• veiled accusation
• veiling
• vein
• vein of penis
• veinal
• veined
• veinless
• veinlet
• veinlike
• veinous
• veiny
• Vela
• scattergood
• scattergun