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English word pissbaby comes from English piss, English baby
piss (English)
(intransitive, vulgar) To urinate.. (transitive, vulgar) To discharge as or with the urine. (vulgar) Urine.. (vulgar, slang) Alcoholic beverage, especially of inferior quality.
baby (English)
(archaic) A small image of an infant; a doll.. (informal) A form of address to a man or a woman considered to be attractive.. A person who is immature or infantile.. A pet project or responsibility.. A very young human, particularly from birth to a couple of years old or until walking is fully mastered.. An affectionate term for anything.. Any very young animal, especially a vertebrate; many [...]
pissbaby (English)
(slang, vulgar, derogatory) A whiny or immature person.