Piss Fill 

You're at a bar and you declare that "this" is your last beer. You pay the tab but before you finish that last beer, you go to the restroom. When you return, you find that your glass has been refilled because your drinking buddies were not ready for you to leave. You just had a "Piss Fill". Good bartenders typically do not charge for this service.

He went to piss, "Bartender - give him a Piss Fill"

Piss Fill by Dave at the Urb May 19, 2019

Piss Fillets 

Fish filleted for consumption. Named piss fillet as unlike real meat, it will not make you ‘shit’ but will only make you piss. Common piss fillets are whiting, flat head or mullet.

Caught a couple of piss fillets with me mate out of the tinny on the Barwon on the weekend.

Piss Fillets by BigPappaBear August 12, 2021