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1.
no police on the street and drivers do everything , oh! here is hash mash!
by ELIASr September 14, 2008
 
2.
On Twitter or other social media sites, a hashmash is a posting that is so full of hash tags it doesn't make sense to anyone reading it.
#Colbert buys #eagles for #USDollarCoin at #AmesStrawPoll #GOP #pawlenty #travis #hashmash.
by chondrichthyes August 16, 2011