I have been there myself, thanks to some of my ex-wife's unexpectedly potent brownies, and it was miserable indeed - but I would call it a "bad trip" and not an

I have been there myself, thanks to some of my ex-wife's unexpectedly potent brownies, and it was miserable indeed - but I would call it a "bad trip" and not an "overdose". "Overdose" implies that one has ingested a quantity of the drug in question sufficient to create physical danger, and no such danger exists with marijuana.