Green’s Dictionary of Slang

(Anglo-Ind.) a shower of rain.

1856		H. Mayhew Great World of London I 6: Will you have a shant o’ gatter (pot of beer) after all this dowry of parny (lot of rain)?
1862		Mayhew & Binny Criminal Prisons of London 6: [as cit. 1856].
1873		Sl. Dict. 361: We have had such a Dowry of Parny that it completely Stumped Drory the Bossman’s Patter.
1895		C. Crowe Aus. Sl. Dict. 56: Parney, rain.
1934		P. Allingham Cheapjack 67: ‘Funny. We usually have parny at Whitby.’ ‘Parny,’ I discovered, meant rain.
1964		H. Williams Speakers (1966) 171: Parney? Did you know that word? that’s what the speakers say when it’s raining. They say it’s coming down to parney.
1989		P. Manning ‘Sl.’ in Kray (1989) 62: Now in India when it’s raining they call that parney, / So we borrowed this from India as you can see.
2019		P. Baker Fabulosa 296/1: parnie, parnee, parney 1. rainwater. 2. tears .