Squiggle

I. verb (squiggled; squiggling) Etymology: blend of squirm and wriggle intransitive verb 1. squirm, wriggle Example: squiggling in her seat 2. to write or paint hastily; scribble transitive verb 1. scribble 2. to form or cause to form in squiggles II. noun a short wavy twist or line; curlicue; especially an illegible scrawl • squiggly adjective

Merriam-Webster's Collegiate Dictionary