- A decisive reply, argument.
- Something unusually large, heavy, etc.
- A heavy, finishing blow.
- WHACK! - bum! bum! bumble-umble-um-bum-bum-bum-bum - and the thunder would go rumbling and grumbling away, and quit - and then RIP comes another flash and another sockdolager. - Mark Twain, The Adventures if Huckleberry Finn
- "Your first day awake with us was some sockdolager," Andy said. "You handled them sharps slick as grease." - Darryl Brock, If I Never Get Back