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1: the state of consciousness present after one has exhausted their supply of serotonin, effectively rendering them to human drone status

2: the afterglow from MDMA or ecstasy which causes one to aimlessly wander as if a brainless drone
"Dude Tom has been super out of it since the rave last night"

"Yeah, he's serodronin yo"
by Alejandro of the Brooklyn Zoo November 02, 2012