Prior to Dipper and Mabel Pines' arrival in Gravity Falls, the three wreaked havoc upon Ma and Pa Duskerton following their ban of all teenagers from the Dusk 2 Dawn, giving the elderly couple double heart attacks, resulting in their deaths and the closure of the convenience store. The teens' dumping of "loser candy" left over from Summerween inadvertently gave life to the Summerween Trickster, who eventually killed them.
They first appeared in a flashback during "The Inconveniencing," where they were depicted protesting Ma and Pa Duskerton's banning of teenagers from the Dusk 2 Dawn by playing "Homework's Wack" on a boombox and dancing outside the store, which led to Pa and Ma having double heart attacks, resulting in their deaths.
The teenagers appear again in another flashback during "Summerween," where they are depicted tossing loser candy into a dump. The candy would eventually collect together and gain consciousness, becoming the Summerween Trickster.
The teens seem to have stereotypical personalities, acting cool, laid back, and rebellious. They are seen either dancing to rap music or dumping away "loser candy."
Jeffy Fresh, Byrone, and Rosie are dressed in stereotypical '90s clothing: "cool" hats, shirts, vests, and pants can always be found on them. They make sure they appear in a cool manner by doing things such as wearing earrings and sporting "cool" hairstyles.
- 212. "A Tale of Two Stans" (flashback, no lines)
- Jeffy Fresh, Byrone, and Rosie are responsible for creating three of the creatures Dipper and Mabel have encountered so far: Pa, Ma, and the Summerween Trickster.
- In the game PinesQuest, a grave can be seen marked with their names. The gravestone also states that they "Ran afoul of a trickster," implying that they were killed by the Summerween Trickster.
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