Top Definition
An activity that one does while gacked out on some gacky drug ie ecstasy, mollie, coke or meth.
We better bring Apples to Apples to her house so we will have a gacktivity to do while we are bored and all gacked out.
There are alot of gacktivities happening at this awesome rave.
by Ms. Behavin January 26, 2010

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