From Longman Dictionary of Contemporary Englishwigglywig‧gly /ˈwɪɡəli/ adjective informal CFBENDa wiggly line is one that has small curves in it → wavy
Examples from the Corpus
wiggly• The best practice is to try steering a controlled wiggly course using your weight.• She wrote with large wiggly letters.• And you see those wiggly lines on the top?• Bottom turns and cut-backs are performed along the wave leaving a wiggly wake. 