The Collaborative International Dictionary of English v.0.48:

Sniggle \Snig"gle\, v. i. [imp. & p. p. Sniggled; p. pr. & vb.
   n. Sniggling.] [See Snig a kind of eel.]
   To fish for eels by thrusting the baited hook into their
   holes or hiding places. --Walton.
   [1913 Webster]