Top Definition
Marcosis is a rare condition that causes a group of people to forge an alternate persona through the internet and photoshop. the early stages of Marcosis are useally characterized by symptoms similar to schizophrenia, but as the condition progresses others in a tightly knit circle around the subject start to aknowledge the beings exsistance as well.
damn aubreys got a serious case of marcosis, have you ever noticed how milhouse shows up in your dreams dressed as Marco Gutierrez?,
by ashmosus August 03, 2011

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