Top Definition
The act of slacking constantly. Being very lazy.
Adam: Dan did you do the english homework?
Dan: Hell no!
Adam: Slacktastic!
by Brian Williams March 04, 2004
1 more definition
adj. something completed at the last minute that is beyond brilliant in any circumstance.
That essay I wrote this morning was so slacktastic.
by SV7 May 04, 2010

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