The story
Perhaps an ellipsis of "(can you) guess what I am about to say/what happened next?"
Etymology from Wiktionary, CC BY-SA 4.0.
guess what
Today it means: Used other than figuratively or idiomatically: see guess, what. Full definition →
Today it means: Used other than figuratively or idiomatically: see guess, what. Full definition →
Perhaps an ellipsis of "(can you) guess what I am about to say/what happened next?"
Etymology from Wiktionary, CC BY-SA 4.0.