A serious mental condition, when IB students seem to lose all sense of the world around them. Can occur at any time before mock examinations and can last for looong periods. Also includes hysterical laughing or sudden sobbing.
"What are those students laughing at"
"They are laughing at a picture of Lenin holding Stalin as Virgin Mary does Jesus."
"...Why exactly?"
"I dunno. Probably pre-mocks nobrain."