The chemical reaction within your skull caused by an amazing, revolutionizing, bordering on orgasmic, revelation - often related to a very nerdy subject (but not always, as seen in the example). I.e. a meltdown of the brain. More intense than mindblowing.
Guy 1: Hey dude, I heard Chuck Norris can divide by zero..
Guy 2: OMFG! *brainplosion*
Guy 1: Dude..?
Guy 2: Gaahhh.. *drooling*
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. PenguinBooks,1992. p. 38)