Scuth the whip
Heard in Dublin
To hitch a ride on the back of a lorry or cart, a boyhood pursuit from the days of horse-drawn drays when children would jump aboard unseen; bystanders would sometimes call out to prompt the driver to flick his whip in warning.
Hi Jimmy scut yar whip
I say, James, do hitch a clandestine ride on the back of that cart.