Example usage:
"Jim, that shipment was supposed to go out thirty minutes ago, quit fucking the dog!"
or
"Hey what are you up to right now?"
"Oh, nothing, just fucking the dog."
or
"Isabelle hardly gets anything done, she's a real dog fucker."
or
"My manager at work just fucks the dog all day, I have never seen him do anything useful."
Not American but I use it on occasion. Definitely was weirded out a bit when I first heard it, now I think it's one of the funnier things to become a common idiom
The look on my yankee wife's face when she first heard me say it lmao
The wiki link says it came from Canada, so I guess it makes sense I'm used to hearing it.