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2.
activities in which on man partakes in sexual relations with themselves
Charles was banished after being caught participating in jacktivities at the playground
by The T.I.P. Drill October 25, 2009
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1.
The amalgamation of the word activity, and the British Army slang word "Jack" meaning selfish or lazy.

A jacktivity is something a multitude of people will do in order to evade hard work.
Person 1: "While we're in here, the smokers go outside every 5 minutes and evade the hard work."

Person 2: "That's such a jacktivity."
by Nicko678 December 13, 2009
5 0
 
3.
1. an assigned task that is nothing but a worthless, waste of time jack-off activity.
1. There was nothing worthwhile to do at work today so the boss assigned me a jacktivity to keep me busy.
by ETQuall March 21, 2012
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