slammer

noun

1. One who, or that which, slams.

   “Margaret was also, by her own admission, a determined slammer of doors.”

2. (slang)Jail, prison.

   “A man being sentenced for starving some horses chose 24 hours in the slammer with no food rather than seven days with the regular amenities.”

3. A tequila cocktail that is slammed onto a surface to induce fizzing.
4. One who takes part in slam-dance.
5. One who competes in a poetry slam.
6. In the game of Pogs, the heavier piece used to strike the stack of counters.

   “The basic modern 'Pog' game is played thus. Each child tosses a pog into the arena, face-up or face-down, as agreed. Each player in turn takes his slammer and pitches it hard onto the accumulated pile of pogs.”

7. (UK, slang)A slam-door train.

   “I was in Britain, wanting to take a train to Portsmouth, and I only needed a one-way ticket. I did love the English trains; we still had slammers then. A slammer is a train where you got to slam the door shut yourself.”

8. A fraudster who carries out slamming (fraudulent changes to a customer's service).