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1.
When one tends to indulge in marijuana excessively on a rare occasion.

This leads to, because of a lack of MJ tolerance a chain reaction of overthinking about ones life dreams, goals, hopes, aspirations, AND f-ups over the course of the last 5-10 years!
Dude, I gots ta smoke more weed.....last night I crossed the line and got overstoned

" Hey Jonny, Give me a hoot!" Watch yourself bro, this shit'll get you Overstoned
by jayfrocran January 31, 2011
 
2.
adjective; being in a state of excessive intoxication or overly altered by narcotics
Want another hit? No way man,I a'm overstoned!
by happynotlucky March 11, 2009