squiggly /ˈskwɪɡli/adjective 1noun 1forms 3 adjective1 •(informal) Not straight; wavy and irregular.She didn't have a ruler, so she drew a squiggly line to highlight the main points. noun1 •(informal) A wavy underline used to indicate an error in text or source code.If you have dynamic spell checking enabled, your pamphlet will become a sea of red squigglies. — 2007 formssquigglies · squigglier · squiggliest