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1.
Activity that is Wack. Like.. "that shit is wack". Often produced by wacktivists.
Gee, there sure is a lot of Wacktivity up in hea'.
by Miker May 16, 2003
 
2.
Wacky+activity=wacktivity
A wacky activity that looks like a game without the athletic edge of a traditional game. As coined by Kidz Blitz.
Jumping rope while wearing scuba flippers is a Wacktivity.
by terrandipity January 03, 2014