To eat so much of a marijuana edible that you freak out and get into the fetal position. Sometimes referred to as "pulling a Maureen Dowd".

The term originated in a Colorado hotel room.
Timmy just overdowd, he ate the entire pot brownie at once and now he's balled up trying to write a newspaper column.
by JamezT July 9, 2014
Get the Overdowd mug.