Top definition
A word used by The Lorax fandom for the pairing between the Once-ler and the Greed-ler.
Person1: ''The Onceler and the Greedler are the same person, though.''
Person 2: ''I know, it's kinda like a guy dating his own brother, the fandom calls it onecest.''
by nini21 May 29, 2012
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