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1.
A type of precipitation that is unidentifiable - it is usually a mixture of snow/hail/rain/slush coming from the dark grey sky, while it is absurdly cold outside.

Origin: Ithaca, NY
Braving the cold, John stepped outside only to realize it was Ithacating - he was drenched and frozen within minutes.
by Ithaca is really cloudy November 30, 2010