The Jojo Siwa Phase is when a little girl (usually the age of 5 to 7) decides to be a dumbass and act like jojo siwa.
Katie: My little sister is going through the Jojo Siwa Phase.
Marley: So?
Katie: She thinks she is jojo and gets the same clothes as her and sings like a pisshead.
Marley: wtf
Also Aiden, Fuck you too.
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