slackfired
When you do something half-assed and end up making it harder then it would've been if you had just done it the right way to begin with.
Well, mopping the floor without vacuuming up the dog hair first really slackfired.
slackfire
To unintentionally make achieving a goal more difficult by trying to achieve it the fastest, easiest, cheapest way possible.
My plan to save money by not doing routine maintenance on my car slackfired when the engine blew.