Hindi जूठा खाने से प्यार बढ़ता है (jūṭhā khāne se pyār baṛhtā hai)Your love [for someone] increases when you eat [someone's] tainted food.

Jūṭhā is basically food or a utensil that someone has eaten or eaten with and therefore *tainted* it. If someone eats that food, the love between them is supposed to increase. This is mainly used when two people are going to be arranged-married and some person (usually an older auntie) tells the bride to eat the same food or with the same utensil as her fiancé.