A metaphor that you shouldn't ever take literally. It's true meaning is "to have lots of fun". The word 'blast' originates from big. So now, when you hear somebody say "Let's have a blast!", you won't have to wonder what they mean. Because, they're trying to tell you that the next following days are going to be fun!
Tomorrow, I'm going on a Summer trip to LA. Oh my god, we're also going to the beach and having cocktails! My life will have a blast!
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)