Riding a surfboard that is too big for prevailing wave conditions. "Gun" is shorthand for "big-wave gun" or "elephant gun." Being overgunned is often the result of misreading the surf: a surfer takes out his 7'6" board, for example, thinking the waves are eight feet; when the surf turns out to be six feet, the rider feels overgunned, wishing he brought a faster-turning 6'10".

At particularly crowded breaks—Rincon, for example, or Sunset Beach—surfers will sometimes overgun as a tactical ploy...