ha-ha Meaning, Definition & Usage

  1. noun a loud laugh that sounds like a horse neighing
    horselaugh; haw-haw; hee-haw.
  2. noun a ditch with one side being a retaining wall; used to divide lands without defacing the landscape
    haw-haw; sunk fence.

WordNet

Ha-ha" noun
Etymology
See Haw-haw.
Definitions
  1. A sunk fence; a fence, wall, or ditch, not visible till one is close upon it. Written also haw-haw.

Webster 1913