She was born in India as "Dirt Terroso". As a child, Dirt faced a lot of bullying because of her name. Eventually, she had enough and fled to Delfino Plaza once she was old enough to create a secret level. At Bianco Hills, Dirt spent some time trying to come up with ideas. Meanwhile, Lily Secretii had just finished construction of her Lily Pad Ride. The water from Lily's level spilled onto the lake located in Bianco Hills, polluting it. Dirt sees the dirty lake and comes up with a plan for her secret level. Not long after construction on Dirt's level was finished, Dirt met Hillary for the first time; it was love at first sight. The two Secretiis eventually got married, but they couldn't have a child until nobody saw the relationship as incest. After the incest drama was over, they had a child.
- Mashed potatoes and gravy
- Grimy water
- Chocolate pie
- Super Mario Sunshine
- Hillary Secretii
- Turbo Secretii
- Lily Secretii
- Splashing around in water
- Number 69
- People who say "no offense"
- The person who called her "terrible"
- Tottie Babs
- Strangers (she learned to never trust them)
Dirt gets offended rather easily. When offense does trigger, the reaction level itself is excessive. Even though Dirt tries her best to be a loyal companion to Hillary, she can occasionally get domineering and try to do things her way and never allow Hillary to step in and try to help.
Hillary is Dirt's younger sister. However, since Hillary never had a life outside of Bianco Hills and Dirt was born in the real world away from Delfino Plaza, it was love at first sight once Hillary met Dirt. They eventually got married and had a child (see Aero Secretii's page for more details).
Caladbolg loved Dirt so much while she was in the Hunger Butts, to the point of screaming unfair once Dirt took her own life. Dirt's name was called the best one. Dirt was the top pick of the year. Caladbolg even corrupted Dirt to the point that she killed the three other characters involved in a suicide pact before taking her own life. Dirt did consider leaving herself out of the cast of the third season of the Hunger Butts because of her sustained permanent scars, but Caladbolg revealed that two characters must be signed up, resolving Dirt's problem.
Dirt severely dislikes Dragonlord after he ruined her first return to the Human Sunshine Project.
Lily's secret level was what inspired Dirt to use a dirty lake to provide a challenge for those who want to enter her secret level.
She once left the Human Sunshine Project from November 30, 2016 to January 15, 2017 because she was called "terrible". This confirms that she has a terrible intolerance to being insulted.
Dirt's return only lasted for sixteen days. She had to leave once again once someone insulted how her hair works. Dirt did return again, this time on March 19, 2017.
Despite the fact that Dirt is older than Lily Secretii, Lily created her secret course before Dirt did.
Along with Shelli Secretii, her level could be found in beta images of Super Mario Sunshine.
Her pre-tantrum lines reveal that her middle name is "Terroso".
Dirt is the first character to have permanent scars in her design.