Green’s Dictionary of Slang

pish v.

1. to urinate [piss v. (1)].

[US] in E. Cray Erotic Muse (1992) 3: When he got home, for want of a dish, / He put him in the pot where his old woman pished.
[UK]J. Fagan Panopticon (2013) 52: A drunk woman sits on a plastic chair [...] She’s pished herself.

2. (Scot./Ulster) to rain heavily [piss v. (3)].

[Ire]Share Slanguage.
[Scot](con. 1980s) I. Welsh Skagboys 22: As ah hit the fioot ay the Walk it tsarts tae pish doon; cauld, skin-stining rain.
Twitter 17 Nov. 🌐 In related news, it's pishing it down here.
[Scot]A. Parks May God Forgive 51: ‘It’s pishing down out there’.

In phrases

I can only pish/piss with the cock I’ve got (v.)

one’s actions are limited to the information/resources available.

[Scot]L. McIlvanney All the Colours 14: ‘Can only pish with the cock I’ve got, Norman. Nothing’s happening’.
[UK]D. Bailey Croawling Out of Hell 78: [Y]ou can only piss with the cock you've got.
Big Narstie How to be Narstie [ebook] In the immortal words of my mate Andy: you can only piss with the cock you've got .