Green’s Dictionary of Slang

1. (UK black) a slow-witted individual [neg. stereotyping of an Irish person, i.e. Paddy n.].

2018-20

T. Thorne (ed.) ‘Drill Slang Glossary’ at Forensic Linguistic Databank 🌐 Patty - slow-witted, ‘clueless’ or deluded person.

2. see also under paddy.