Noun
postnup (plural postnups)
postnuptial agreement
He claimed his then-wife 'went berserk' when he asked her to sign a 'postnup' agreement, hurling a Vodka bottle at him which shattered on a marble counter-top and ripped off the tip of his finger. Source: Internet
Importantly, a postnup can document that thedecision for you to stay at home was one you made collaboratively with your spouse. Source: Internet