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1.
A condition that strikes a once helpfull individual and causes them to suddenly not want to do anything. The affliction often never improves and usually the victim becomes more lazy and will slack off beyond all hope.
Dad ( after work ); "Why aren't the leaves raked ?"
Mom (After cleaning house all day, paying bills, still washing last nights dishes and preparing dinner.); "Our houseguest had another slackattack."
by jpg3 November 28, 2011
 
2.
The act of purposefully slacking off on an activity (homework, practice, working out, cleaning, etc.) by not completing the activity in its entirety or taking extreme short cuts to avoid having to work hard or spend a considerable amount of time on the activity.
I'm definitely going to slack-attack my workout this afternoon. I'm only going to ride a bike for 30 minutes and just forget about that 2 mile run and lift that I am supposed to do..
by sschirem March 07, 2013
 
3.
Similar to a heart attack but the victim suffers numbness of the legs and a slowed heart rate and the craving for anything crunchy.
Guys hold on, I think I'm having a slack attack!
by Everybodyonce December 14, 2006
 
4.
Similar to a heart attack but the victim suffers numbness of the legs and a slowed heart rate and the craving for anything crunchy.
Guys, I think I'm haveing a slack attack!
by Everybodyonce December 16, 2006