Green’s Dictionary of Slang

parro adj.

also paro
[abbr.]

paranoid.

[WI]Francis-Jackson Official Dancehall Dict. 39: Parro paranoid, paranoia as a result of being stoned.
[UK]‘Q’ Deadmeat 111: ‘You’re not lying to me,’ I asked [...] ‘You’re paro.’.
[UK]Skinnyman [...] ‘Little Man’ 🎵 He’s in a cell, he’s in a parro state.
[UK]G. Krauze What They Was 229: I ’m feeling more and more parro, tryna drown my thoughts in clouds of loud.