Slammer (slang) Type: noun, slang Pronunciation: /slam-err/ Also known as: The Slammer Plural: Slammers What does Slammer mean? A jail or prison. Slammer Synonyms: Can, Up north, Cage, Pen, Box, Kennel, Central booking Example sentence: “They free’d my guy out the slammer.” Slammer in songs: “Free all my day one niggas out the slammer” – […]