Green’s Dictionary of Slang

(Aus.) a general expression of continual bad luck.

1926

F.W. Pollock ‘The Current Expansion of Sl.’ in AS II:3 145: He may bemoan his fate in this wise, ‘I’m so unlucky, if it rained soup, I’d be there with a fork’.

(US short-order) an order for a glass of milk.

1910

Ocala Eve. Star (FL) 20 June 1/5: ‘Glass of milk,’ says a customer. ‘Ket it rain!’ shouts the waiter.

1. (US) for a patron of strip club to toss bundles of notes into the air so that it ‘rains’ on the girls.

2005		Urban Dict. 14 Sept. 🌐 fter Leroy finished trapping for the night, he went to the strip club, got 10 stacks, and made it rain inside the club the whole night.
2020		S.A. Crosby Blacktop Wasteland 59: [H]e had drunk away two hundred dollars, made it rain with a hundred dollars’ worth of ones and gambled away the rest.
2020		Cardi B ‘WAP’ 🎵 Make it rain if you wanna see some wet-ass pussy (Yeah, yeah).

2. (US black) to bring in money for onself and one’s associates.

2008

‘Grandmaster Flash’ Adventures 229: She and my new attorney [...] made it rain. The gigs were small at first, but [...] what started as a drizzle became a steady flow.

see rain (like) stair-rods under stair n.

(N.Z.) to rain heavily.

1938		N. Scanlan Guest of Life 339: She says it’s raining Duke Georges in Wellington.
1950		N. Scanlan Confidence Corner 14: It’s going to rain Duke Georges if you ask me.
1988		McGill Dict. of Kiwi Sl. 91/1: raining like a drunken dog raining heavily; variant on ‘raining cats and dogs’.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].

1. to kill; to agress severely.

1976		Tom Waits ‘Small Change’ 🎵 Well small change got rained on with his own .38 / and nobody flinched down by the arcade.
1985		T. Wolff ‘The Poor Are Always With Us’ in Back in the World 76: ‘[A]ll the time old Charlie Cong is just raining on him. I mean he’s got holes in places you never even heard of’.
1991		D. Simon Homicide (1993) 323: Someone was looking for Clayvon [...] and Clayvon got rained on first.
1997		(con. 1970s) G. Pelecanos King Suckerman (1998) 192: It wouldn’t be just you I’d rain on.

2. to make suffer, to beat up, to lose one’s temper with.

1963		B. Hecht Gaily, Gaily 197: Nobody gives a damn who gets rained on—if they’ve got an umbrella themselves.
1967		(con. 1920s) J. Thompson South of Heaven (1994) 38: We were both of a mind to [...] rain all over the timekeeper.

see piss on someone’s parade under piss on v.