Top Definition
n. an obnoxiously long online discussion whose subject matter may concern a multitude of different topics. used in any context pertaining to online threads, esp. facebook messages. often aggravates the lesser known psychological condition known as macronematophobia.
origin unknown
"Dude, have you been keeping up with the dinner thread? It's five hundred messages long!"
"Nah, man, my shrink said I can't; I'm macronematophobic."
"Bogus, dude."
by Il Bianco April 01, 2008

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