Fucking well
Definition 1 of 2
Pro Tip 1/3Emphasis on Action
Highlights the importance of doing something well or with great care. 
You'd better fucking well check every detail.
Pro Tip 2/3Strong Command
Communicates a serious and urgent command, often showing frustration or anger. 
You fucking well listen to me when I'm talking.
Pro Tip 3/3Informal Tone
Used in casual or informal situations among friends, not in polite or formal settings. 
We're going to fucking well win this game!