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The disorder whereby a girl may be calm and fun to talk to one day, and be an utter bitch the next day. Acts of kindness include offers of help and general pleasantness, while acts of bitchiness may include apparent constant ragging and hurling sharp objects.
The mood of which may be shown as a pattern of two bitchy days and one good day.
Named after the victim of the first recognized case: Jannika.
"Did you talk to that new girl yet?"

"Nope, not yet. She's on day 2 of bitchiness"

"What do you mean?"

"She has Jannikism"

"Oh, gotcha"
by lysdexic loof November 10, 2008
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