Due to the extremely candid and casual nature of this word and it’s usage, it’s difficult to pin down exactly the circumstances in which it’s use is “correct”. There are no specific rules in regards to the lexical correctness of that word. If it sounds good and flows well with the context (as in the case of “abso-fucking-Iutely”) I would say go for it. If it sounds awkward or like you’re trying too hard to fit “fucking” into your speech just to sound badass (as in the case of “ex-fucking-actly”) then I would suggest you leave it out. You kind of develop an ear for it after a while. I’ll add a caveat (which almost goes without saying): just be aware of your audience when you use such language. You don’t want to get slapped by some crazy grandma who doesn’t appreciate your dirty mouth!😂😉

Ditto what Grace says. until you develop an ear for it and a feel for word rhythm in the sentence only use the most common one that Grace highlighted "abso-fucking-lutely" and be aware of the company you are in.