Top Definition
A cumulonimbus cloud with dry lightning. A firefighter (usually a wildland firefighter) calls this a cumulus overtimus in reference to the overtime that he / she will make if there are down strikes that start a fire.
While standing at the station looking at the clouds or when listening to the weather report that predicts dry lightening.

"It looks like there is a big build up of cumulus overtimus."

or

"Bring on the cumulus overtimus."
by AlistairMacIlherron September 21, 2009
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