piss on it

piss on it

interjection, rude slang An exclamation of reckless determination, with disregard to the consequences. A: "You sure you don't want a beer?" B: "Oh, piss on it—open one up for me. I guess I'll just deal with a hangover at work tomorrow." She stood looking down where her friends had jumped into the river. "Piss on it," she thought, as she took a running leap off the edge.
See also: on, piss
Farlex Dictionary of Idioms.

Piss on it!

in. To hell with it! (Usually objectionable.) Oh, piss on it! I’ve had enough!
See also: on, piss
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • Piss on it!
  • in-your-face
  • get out!
  • cool
  • dynamite
  • boom goes the dynamite
  • bloody oath
  • oath