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1.
To do nothing at all, or at least nothing of productive use.
Bill was so hung over at work on monday, and the boss was out. He just sat at his desk and fucked the dog all day
by tx November 25, 2003
 
2.
1. to waste time doing nothing

2. to make a severe mistake
Don't just stand there and fuck the dog, get going.
by The Return of Light Joker March 17, 2008
 
3.
Relaxing by doing as little as possible. Generally one might watch TV, eat and nap.
by Alex August 18, 2003
 
4.
To commit to the least amount of exertion possible while remaining efficient to the lightest extent.
Boys, we're ahead of schedule. We can fuck the dog until the boss comes.
by Alex87 November 05, 2005
 
5.
Means dragging something out, or finding an excuse to not be working. Taking longer, sometimes 3 times longer to carry out tasks, just so you look busy.
Taking an hour to fill up a bin of water, the bin should take 10 minutes. He loves to 'fuck the dog'
Leaving to go to another area on the job site, then texting if anything is needed before they go. He's been fucking the dog for 20 minutes'
Taking an hour on a 30 minute job, hoping that someone doesn't notice. "lazy fuck, whata lazy fuck, he's fucking the dog'
Going to the 'bathroom' when infact having another smoke
Taking the long way round to do something.
Volunterring to go and do a simple job, or pick something up for someone, when you know they are going thet way anyway.
Pretending to be making an important call to someone that isn't infact answering 'that call'
by Bill Finley January 19, 2012
 
6.
screwing the pooch. giving the dog a bone.

From the movie "Sid and Nancy":
SID: "I was so bored once, I fucked a dog."
by gonzo raul June 15, 2004
 
7.
Riding Greyhound or any other bus lines.
" I can't afford plane tickets so I guess I'll fuck the dog."
by Adam30 July 13, 2006