1 definition by rck352

1. Not being able to make a competent play because of either an inability to make a timely decision on how to strike or another player causing mental interference.

2. In ping pong, when a defensive player cannot decide whether to use a forehand or backhand resulting in an awkward combination of unathletic moves.

3. In volleyball, not being able to choose between setting or bumping most likely resulting in being hit in the chest/face. Hitting between two players causing both to assume the other will hit is also considered proper usage.
Player 1: Don't get jammed up son!
*player 1 serves to player 2's hip*
*player 2 is unable to return ball*
Chris Dobson: Awwwww. I'm all jammed up!
by rck352 May 25, 2010
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