pissless🔊adjEtymology From piss + -less.1Slang, Vulgar Synonym of shitless (“greatly frightened”).He was scared pissless.2Rare, Slang, Vulgar Without urine or urination.Tyler, I'm inventing a pissless wine and a pissless beer. Then I shall turn my attention to the bean. Lincoln Byrd's guaranteed windless baked beans.1966, Robert Watson, Three Sides of the Mirror, page 132: