Best definition
An expression used when the absolute most terrible thing has happened to someone and the realization that you or anybody

else cant do a damned thing about it.

You ask a guy to help you with your car because its having problems. He gets in the car after fixing it and takes off with your wallet, phone, and laptop inside. You yell for help, but soon realize that there is no one around. So the only thing to do is silently utter to yourself, Wellfuck.
Wellfuck: define #2
Well. fuck
When something bad is about to happen to you and you know you deserve every bit of it, but still weren’t expecting it. This is what you say
-Hey charlie -Yeah? -I’m gonna kill you now. -Well. fuck
Wellfuck: define #3
Well… Fuck.
When something bad about to happen and you have 0 control over it at this point
“I will be unable to pay rent this month..

well… Fuck.”
Wellfuck: define #4
Well Fuck
It’s when you conpletely fuck up.
Rob: Did you ask for head?

John: Well fuck.