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1.
Metaphorical term for fucking someone, or fucking them over. A metaphor for a metaphor!
My boss gave me Dave's project--that's a hose job if ever I heard of one.

Yeah, the vending machine don't work; someone poured salt water into it trying to hose job it into dropping all its change.
by Secret Agent Man September 18, 2003
 
2.
(Noun) Any attempt that has resulted in utter failure.
If a friend seriously injures themself after yelling "Hey guys watch this!" it is considered to be a hose job.
by Quackafella2 June 14, 2010
 
3.
Watering the plants in a friend's garden while he is on vacation.
Steve: Hey John, what are you doing today?

John: Oh, nothing special, just giving Mike a Hosejob.

Steve: You are doing what?!?!

John: Relax, relax. I'm just watering his plants...
by cvdc_m July 11, 2010