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A way of saying theres no way to fix something, or work past something which leads to you either doing something entirely stupid, working past the problem, or trying in vain one last time before giving up.
"Girlfriend just broke up with me"

"Hit it with a wrench"

"I can't walk something is wrong with my foot"

Well thats a bitch get up hit it with a wrench and walk it off"
by The Forty Killer December 12, 2011