Most viral sounds (including many versions of the "Aaa Ooo Aaa" chant) are considered "user-generated content." However, some remixes contain copyrighted beats. For personal use as a ringtone, copyright law typically allows it (Fair Use/Personal Exception), but you should never redistribute the file for profit.
If you need an M4R file (iPhone ringtone format), Ringtones Cloud is a specialized database. aaa ooo aaa ringtone download
Sites offering free downloads without an ad blocker often bundle their files with .exe extensions or require you to install a "download manager." Never download a ringtone file that ends in .exe, .apk (unless you know what you are doing), or .scr. Safe ringtones are MP3, M4R (iPhone), or OGG files. Most viral sounds (including many versions of the