A smiley making a silly face. A yellow face with a big grin and wide, white eyes, one larger than the other and in a wild, cockeyed expression. Many platforms, including Apple, depict its tongue stuck out and head tilted; others feature a full-toothed grin, giving it a more unhinged appearance.
Commonly represents such activities as acting goofy, having fun, and partying as well as various senses of slang terms like crazy, usually in a positive manner. May convey a spirit of wackiness more generally.