Definition of "jammer"

jammer

/ˈd͡ʒæmɚ/

noun
plural jammers
1. Any device used to jam radio reception.
2. A kind of form-fitting swimwear used by athletes, resembling shorts.
  Quotations
  As for me, I wear a dragsuit to the pool, and regular trunks to the beach. In competitions, I wear speedos, but am more comfortable in "jammers", which is a half-bodysuit.
  2001, Newsgroups: rec.sport.swimming, Mon, 09 Jul 2001 21:39:52 GMT, Subject: Re: Laying out in Myrtle Beach
  In early May, I was starting to swim in jammers which I was not accustomed to or comfortable wearing. I have always thought that wearing spandex is an earned privelege,[sic] not a birthright.
  2006, David West, 140.6 - One Man's Journey: The Metamorphosis from Casual Runner, page 62
  Enter jammers in the mid-1990s. Jammers have the look of biking shorts with skin-tight Lycra covering the thigh to mid-thigh or the knee, depending on the cut.
  2007, Janet Evans, Janet Evans' Total Swimming, page 5
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. (roller derby) A player who attempts to score points by making their way past other players.