The effects of ecstacy after you come down. This ranges from feeling icky after a night of use or the gaping minds of individuals who abuse it regularly.
(VERB) Derived from the word retard, an etarded person is someone who has slowed down intellectually, often permanately, from the effects of Ecstasy (MDMA).
"Yo, that kid rolled all summer and he's straight up etarded now. I heard on the news you get holes in your brain, that kid is living proof."