fish·gig(fĭsh′gĭg′)n. A pronged instrument for spearing fish. fisgig , from Spanish fisga , ultimately from Latin fīxus , fixed; see fix.] [Alteration (influenced by fish ) of obsolete, from Spanish, ultimately from Latin; see.] Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.