Definition
A "pisser" is a slang term with a few different meanings, most of which are considered vulgar and should be used with caution π½. It can describe something extremely annoying or frustrating. It can also be used as an intensifier, like saying something is "really great" or "really bad" depending on the context. Basically, it is something causing intense irritation. Understand that the word is considered rude and inappropriate in most formal settings π€«.