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Hash Bash is an annual event organized by the Michigan National Organization for the Reform of Marijuana Laws (NORML). It takes place on the first Saturday of April in Ann Arbor, MI on the campus of The University of Michigan. At high noon on the Diag there are speakers and rallying and afterwards a street fair on Monroe. Ann Arbor has a $25 civil infraction fine for smoking marijuana on city property.
"Who wants to split this brownie with me before we go to Hash Bash?"

"Oh shit, I better take off from work for Hash Bash!"
by Julie! March 26, 2007

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The act of getting someone so drunk that they are unaware of what they are doing and then you perform a sexual act on them, essentially known as drug rape. Hash = Drug, Bash = Sex, Hash + Bash = Sick rapist
Jim: 'Whoa look out I think Harry might Hashbash her, she is off her face, we should intervene.' Dave: 'Yeah your right lets stop him'.
by HMol October 20, 2007

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the act of inhaling yer' stash
After my hash bash, I laid down on the floor and started cooing like a baby.
by alex November 23, 2004

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