Meaning

noun disciple of Jesus and leader of the Apostles; regarded by Catholics as the vicar of Christ on earth and first Pope

noun obscene terms for penis

originUnknown; the following etymologies have been suggested: * From peter (“to stop (doing or saying something)”) (slang, obsolete, rare). * Since the word was first used in mining contexts, either: ** from French péter (“to explode; to break wind, fart”) (slang), from pet (“emission of digestive gases from the anus, flatus, fart”) (slang), from Latin pēditum (“flatus, fart”), from pēdō (“to break…

Etymology from Wiktionary, CC BY-SA 3.0