to be stiff buckuu is to be extremely stiff when you are playing soccer. It's basically the modern term of being cheeks at a game or ass at it. If you have seen a 6'5 man play soccer, hes probably stiff buckuu. Someone who has NEVER played the sport is automatically stiff buckuu.
Chandler: Yo Ethan, you see that one dude over there who is dribbling
Ethan: Yo I'm Crine bro is ACTUALLYStiff Buckuu
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)