This expression is used to describe a person who, while appearing to be the antethesis of everything cool, hot or sexy, nevertheless gets laid more than a veteran pornstar.
It is a lable reserved only for those who are the top 1% in terms of both frequency of sex and number of sexual partners. It isn’t enough that they get laid more than one would expect. No. The person must be getting laid in amounts far in excess of anything beyond comprehension.
What’s more, the lable is only appropriate if person to whom the lable is directed is completely unassuming or apparently beta. It’s not enough that the person gets laid a lot. They have to get laid a lot and equally appear to be the exact opposite of someone who ever gets laid.
Ron: George Costanza is short, fat, bald, nerd. I wonder if he has ever been laid.
Jerry: You’re kidding right!? That Guy Fucks! That guy has fucked over a thousand girls.
.....
The character Jared on the show Silicon Valley, is a weird quirky nerdy modest by-the-book prude. The character is the complete opposite of someone who appears to regularly have sex. In fact, the character is almost a romantic who is likely to have a single life-long partner. His friends and co-workers have no clue that Jared has a secret life of Fucking until it is revealed several seasons later that “this guy fucks.” When the main character shows up to Jared’s apparently he finds him inundated with pussy. Told ya! “This Guy Fucks!”
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)