The Collaborative International Dictionary of English v.0.48:

Wigwag \Wig"wag`\, n. [See Wigwag, v. t. & i.]
   Act or art of wigwagging; a message wigwagged; -- chiefly
   attributive; as, the wigwag code. -- Wig"wag`er, n.
   [Webster 1913 Suppl.]