1. n. a urinal; a place [room, restroom] to urinate. (Usually objectionable.) Who keeps missing the pisser?
2. n. a remarkable thing or person. (Usually objectionable.) Man, isn’t he a real pisser! Have you ever seen anybody bat like that?
3. n. a terribly funny joke. (You laugh so hard you wet your pants. Jocular. Usually objectionable.) He told a real pisser and broke up the entire class.