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1.
Major amnesia.

Amnesia in its highest and strongest form.

A serious short term memory impairment.

A state of a person after too much consuming of cannabis products. In such state a person can not remember anything what happened to him during and/or after the marihuana intake process.
In Amsterdam coffeeshop:

Big D: I'm not sure that I remember on which
canal bridge did I park my bicycle.

Ganja Tour guide: Man, you've got yourself into
amnesimus.

Big D: Sorry, what was I saying?

Ganja Tour guide: Don't know man, I've got amnesimus
all over me.
by Julian Van Eckhorst March 28, 2010