John: schwiggity schwag, what's in the bag?
Sara: nothin, just a bag of potato chips (sara is eating potato chips) schwiggity schwag, what's in YOUR bag?
John: nothin, just some math homework (john is doing math homework)
Referring to a secret/rumor you're not sure has gotten around
Person X: Has the secret/rumour gotten around yet?
Person Y: Dunno, Schrödinger's Cat's in the bag
Person X/Y once rumour has gotten around: Guess Schrödinger's Cat is out the bag now