A term used to describe someone who uses the 'f' word a lot at the worst possible times during general conversation. For example, if the said individual was giving a speech at a wedding... 'Ron is the best bloke ever. I remember when we went to Amsterdam and he Fucked that hooker...' or if they were talking to their nan... 'fuck nan, I just dropped your fucking false teeth down the fucking toilet' or the worst, when they are talking to their partners parents. 'I fucking love her, your daughters fucking awesome.'
Everyone knows at least one of these. They are people who are so stupid, it's a wonder they can tie their shoelaces, yet are arrogant about how 'smart' they are convinced they are.
Someone who think's they're the best and brightest, but literally couldn't hit the hole, so to speak.
Bob: "You have to believe me! I am a leading authority in biblical philosophy and I guarantee you that the world is flat!"
Tom: "You are SUCH a fuckblunder!"