Don’t be lackadaisical or lollygag along! Learn new words so you don’t talk poppycock. Maybe next time you meet a whippersnapper you can flummox them with words! There’s no need to feel discombobulated if you hear gibberish and gobbledegook, and don’t be woebegone – learning new words can be easy once you start!
I love the Scots saying: "away and be wise".
Not only has it got a nice ring to it, but with the right intonation, it sounds menacing. :)