Such a phrase should only be used when you cannot remember what you were originally talking about, and need time to think. Instead of saying "Ummm" or "Errr", you would say "Fucking..." Followed, after a slight pause, by "...Wolverine."
Phillip, to Ben; "Dude, I just had a thought! You look like Fucking, Wolverine."
Phillip; "Fucking, that pirate guy from that film, you know the one."