"It's pissing pissing"Harrumph! (copyright from Auntie required)
Doesn't seem that long ago when saying "it's pissing down"
was an intensifier, on a par with "it's absolutely chucking it down". It also expressed being pissed-off with the fact that it was raining. Somehow or other the word's been watered down
and now
pissing just means
raining, that's the problem here. Well, it's a problem to the extent that, like me, you prefer the Absolute Gravity of your expletives kept good n' high.
Actually this is a regional thing, 'cos if you looked out of the window and said "it's pissing" in Britland (even omitting the "down") I reckon most people would assume you meant it was raining heavily.