as a verb:
"All he did last winter was hiberbate."
as a noun:
"This smallness of this town is conducive to hiberbation."
or
"I envy that particular individual for his consummate position as an avid hiberbator."
The effects of marijuana usage that remain for a time after the high has worn off, such as forgetfulness, lack of motivation, apathy, and general emotional fucked-uppedness.
Not noticed so much in occasional users, but very obvious in those who buy Zig-Zags by the case.