"infinity times what you bring home every week" means infinity multiplied by the amount of money that you earn each week. Since infinity is limitlessly large quantity, the speaker is wildly exaggerating for humorous effect.
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VorparHe's suggesting that she not complain about him spending money when she doesn't earn any.In that case, then, it is less of a wild exaggeration and more of a mathematical indeterminateness.
AnonymousI naturally understand it but it still doesn't fit to the context of this dialogue. Or maybe I still don't get it.I think this is the dialog you're referring to. I found it online.
Anonymousdid you notice that it was Peter talking this phrase to Lois, not she to him?The speakers appear to be:
fivejedjonLois: It's only infinity times what you bring home every week.No, this phrase belongs tu Peter, definitely. That's why I'm trying to figure this out.