Expression used all the time by Young People
To carry someone on the back. Piggyback ride.
"Lucía se torció el tobillo y tuve que cargarla a manchis durante todo el recorrido por el museo."
"Lucía sprained her ankle and I had to carry her on my back for the entire tour of the museum."
Added August 2020 by ruedda
4 out of 7 Spanish speakers have heard this