Top Definition
Severe "brown snow" weather incident. Usually accompanied by gale force winds, and heavy precipitation.
(1) James warned Chris : "If you drink any more real ale and have to visit the toilet, you will have a shartalanche on your hands ..."

(2) Pierre had eaten some bad mussels for lunch. His decision to go off-piste skiing carried a high risk of starting a shartalanche ...
by Fubby May 10, 2006

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