An exclamation used to express how exciting or overwhelming something is, literally to the point that it is making one's heart beat too quickly. It is almost often used sarcastically to imply that something is actually unremarkable, dull, or unpleasant; entailing the opposite effect.
Howard: I would have been able to go to the party with Kevin after work, but my hardass boss wants me to stay and finish my co-worker's paperwork for him. Be still my heart!
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)