piss rust 

The rust that builds up on the radiator next to the toilet, cause you keep on missing.

What's that Mr. Pettiwinkle?

That's just piss rust Johnny.

piss rust by RampageZ May 30, 2013

Rusty Piss Clam

when you soak a barrell of live clams in piss overnight, turn them in your partners ass 360 degress and boil them for 15-20 minutes until they are tender .... if they float to the top of the water its now a rusty piss clam floater ......... which is where you bob for the clams in the before mentioned barrel which is now fully fermented

Gary and Andy collected piss clams on the beach then brought them back to the house for a old fashion rusty piss clam bake ....... then they collected the piss clam floaters and bobbed for piss clams

Rusty Piss Clam by WikidThoughtz December 8, 2009

Rusty piss 

When you got diarrhea that is the consistency of piss and the colour of rust.

Dude sorry I couldnt come out last night my shit was like rusty piss

Rusty piss by Norfolk n Chance December 9, 2016