The state of mind that follows the 2-4 hour stoned
period. It usually only occurs after smoking a great quantity of weed. A burn out can last a long time - typically 7 to 12 hours after coming down from the high. The burnt out state of mind is characterized by an intense exhaustion, the inability to focus, a general mental dullness, the slight slurring of words, and a sensory numbness.
Being burnt out and being stoned are two very different feelings. While the "high" state typically involves a distorted perception of time, an acuity of senses, minor paranoia, and the tendency to stare, the burnt out state has none of these qualities.
Also known as a weed-over.
I can't solve this physics problem - I'm so burnt out, all I want to do is take a nap.