"Keep your goals away from the trolls."
Both of these are even better with "In bed" added to the end.
I've only heard it in the past 15 years or so, so I didn't grow up with it, and I have no idea where I first heard it. It might be a regional thing, but I don't know.
(Wow. I just re-read this and I don't seem to know much of anything today, do I?)