Mimilarious means being hilarious however in the way a mimi would do it.
and or hyper and childish is the way to go.
Always witty/cunning or sometimes playing ditzy.
There are also the white valley girl moments that come along which sometimes is paired with being sarcastic.
Cat from victorious but more serious
"I'm so hilarious...HILARIOUS HUH LARIOUS... MIMILARIOUS"
Then, there is Jade from Victorious
etc etc find sarcastic snarky people
"Oh really now? Would you like some frosting on that cake you call your makeup face?"