Source : Webster's Revised Unabridged Dictionary (1913)

Sand-lot \Sand"-lot`\, a.
   Lit., of or pert. to a lot or piece of sandy ground, --
   hence, pert. to, or characteristic of, the policy or
   practices of the socialistic or communistic followers of the
   Irish agitator Denis Kearney, who delivered many of his
   speeches in the open sand lots about San Francisco; as, the

   {sand-lot constitution} of California, framed in 1879, under
      the influence of sand-lot agitation.