jammer

noun

1. A player of the massively multiplayer online game Animal Jam (now either the app so named, formerly Animal Jam – Play Wild!, or the desktop game renamed Animal Jam Classic).

   “A growing percentage of "Jammers" are visiting from international territories, and global growth of the Animal Jam property will be a strong focus for Smart Bomb Interactive in 2013.”

   “So come meet over 16 million Animal Jam players, or Jammers. […] Liza appears throughout this book to share her advice and tips with all Jammers.”

   “This Is Animal Jam, which has recently hit magazine racks across the country, is filled with insider tips, a Jammer name generator, games and puzzles and fun facts about the natural world.”

   “Only as an actual adult did I realize how bizarre one particular user-created facet of the game was: an obsession with “adopting” other Jammers, or being “adopted” oneself. […] It’s a little disconcerting to ponder how much of my happy online childhood was spent hanging out virtually with people who were old enough to own Hondas and go on PornHub^([sic]) on purpose (and definitely people old enough to be active on Reddit), but I loved being a Jammer.”

2. Any device used to jam radio reception.

   “"But the Civil Aviation Authority is very worried about 'flyaway' - if someone has bought a GPS jammer on eBay because they don't want drones near their house, it can cause drones to get completely lost and shoot off in a random direction until they run out of battery.”

3. A musician who jams.
4. A device (e.g. a jumar) which will slide along a rope in one direction but not the other, used in rock-climbing, caving etc.
5. A player who attempts to score points by making their way past other players.