Top Definition
When 2 or more cats run down a flight of stairs, causing a rumbling sound and knocking over everything in their path. This often due to excitement and/or food.
"What happened to you, James? You look like you got in a fight."

"No, no...I just got caught in a catalanche and was swept down the stairs."
by James Gerraughty August 14, 2007
5 Words related to catalanche

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