A wavy underline used to indicate an error in text or code.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "squiggly" in a sentence
"And you can see whenever that line of red gets kind of squiggly, you know there's a big time straight-line winds."
"See the two yellow kind of squiggly lines there, those represent roads, the Canyon Road and the Malibu Canyon Road in between an area that's been evacuated."
"CFLs fit in standard lamps and come in many shapes, ranging from ones that look like traditional bulbs to "squiggly" models that take traditional fluorescent tubes and bend them into spiral shapes."