Definitions for paddy wagon
Random House Webster's College Dictionary
(n.)an enclosed truck used by the police to transport prisoners.
Origin of paddy wagon:
1925–30; prob. paddy policeman, generic use of Paddy
police van, police wagon, paddy wagon, patrol wagon, wagon, black Maria(noun)
van used by police to transport prisoners
A police van for transporting prisoners.
Origin: Supposedly from the term Paddy (a nickname for an Irishman).