When somebody at the dinner table asks you to go get them a fork, you go get the fork and then say, "Fork you!" as you hand them the implement.
Frequently elicits audible chuckling if not downright laughter.
{Voni}: Craig, can you please get me a fork?
{Craig}: Sure thing there Voni...(gets fork)...Here you are Aunt Voni. Fork you!
{Voni}: Chuckles quite noticeably
Indicating a losing or lost cause, with origins in the cooking practice of sticking a fork in meat to determine when done. Also "put a fork in me," "stick a fork in it."
“Let me explain, you're 25 now and will likely stay pretty hot for the next 5 years, but less so each year. Then the fade begins in earnest. By 35 stick a fork in you!”