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1.
A gathering similar to a flash mob organized through social media, where a group meets near a small business and spends about $20 each. The location is kept a secret until the last minute, although clues are given out in advance and the business is usually surprised. The atmosphere is usually very silly and fun.

Somewhat related to or an outgrowth of the occupy movement.
Cash mob tonight! Meet at 30th and Juniper.
by sfmc98 December 06, 2011