From Homestar Runner Wiki
Grrl (also spelled as grrrl) is an intentional misspelling of the word "girl", and it is a favorite slang word of Strong Bad, as well as other characters in Homestar Runner cartoons. The spelling is based on the Riot Grrrl scene, a feminist punk movement from the early 1990s.
- Email i she be — The screen name for Great Looking Girl is "gr8lookinggrrl".
- The House That Gave Sucky Treats — If you vote for Marzipan as your favorite costume, the subject will appear as "Marzipan is a Laugh Riot Grrl".
- Teen Girl Squad Menu — One of Cheerleader's shirts reads "rich grrl".
- Teen Girl Squad Issue 2 — The page title is "Teen Grrrl Squad!"
- Email flashback — Strong Bad's opening song ends with "grrrl".
- Email technology — Strong Bad says that "grrl" is a good ending for an email address.